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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 4 |
| 2 | 78 |
| 3 | 399 |
| 4 | 1263 |
| 5 | 3084 |
| 6 | 6395 |
| 7 | 11848 |
| 8 | 20212 |
| 9 | 32377 |
| 10 | 49348 |
| 11 | 72250 |
| 12 | 102328 |
| 13 | 140942 |
| 14 | 189575 |
| 15 | 249824 |
| 16 | 323407 |
| 17 | 412159 |
| 18 | 518035 |
| 19 | 643108 |
| 20 | 789568 |
| 21 | 959725 |
| 22 | 1156007 |
| 23 | 1380959 |
| 24 | 1637248 |
| 25 | 1927657 |
| 26 | 2255086 |
| 27 | 2622556 |
| 28 | 3033205 |
| 29 | 3490291 |
[0,4,78,399,1263,3084,6395,11848,20212,32377, 49348,72250,102328,140942,189575,249824,323407, 412159,518035,643108,789568,959725,1156007, 1380959,1637248,1927657,2255086,2622556,3033205, 3490291] |