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| n | a(n) |
|---|---|
| 1 | 20 |
| 2 | 74 |
| 3 | 186 |
| 4 | 388 |
| 5 | 721 |
| 6 | 1236 |
| 7 | 1995 |
| 8 | 3072 |
| 9 | 4554 |
| 10 | 6542 |
| 11 | 9152 |
| 12 | 12516 |
| 13 | 16783 |
| 14 | 22120 |
| 15 | 28713 |
| 16 | 36768 |
| 17 | 46512 |
| 18 | 58194 |
| 19 | 72086 |
| 20 | 88484 |
| 21 | 107709 |
| 22 | 130108 |
| 23 | 156055 |
| 24 | 185952 |
| 25 | 220230 |
| 26 | 259350 |
| 27 | 303804 |
| 28 | 354116 |
| 29 | 410843 |
| 30 | 474576 |
| 31 | 545941 |
| 32 | 625600 |
| 33 | 714252 |
| 34 | 812634 |
| 35 | 921522 |
| 36 | 1041732 |
| 37 | 1174121 |
| 38 | 1319588 |
| 39 | 1479075 |
| 40 | 1653568 |
| 41 | 1844098 |
| 42 | 2051742 |
| 43 | 2277624 |
| 44 | 2522916 |
| 45 | 2788839 |
| 46 | 3076664 |
| 47 | 3387713 |
| 48 | 3723360 |
| 49 | 4085032 |
| 50 | 4474210 |
[20,74,186,388,721,1236,1995,3072,4554,6542,9152, 12516,16783,22120,28713,36768,46512,58194,72086, 88484,107709,130108,156055,185952,220230,259350, 303804,354116,410843,474576,545941,625600,714252, 812634,921522,1041732,1174121,1319588,1479075, 1653568,1844098,2051742,2277624,2522916,2788839, 3076664,3387713,3723360,4085032,4474210] |