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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 16 |
| 3 | 43 |
| 4 | 107 |
| 5 | 257 |
| 6 | 607 |
| 7 | 1422 |
| 8 | 3318 |
| 9 | 7727 |
| 10 | 17978 |
| 11 | 41810 |
| 12 | 97214 |
| 13 | 226014 |
| 14 | 525439 |
| 15 | 1221519 |
| 16 | 2839710 |
| 17 | 6601549 |
| 18 | 15346765 |
| 19 | 35676927 |
| 20 | 82938821 |
| 21 | 192809396 |
| 22 | 448227496 |
| 23 | 1042002541 |
| 24 | 2422362052 |
| 25 | 5631308596 |
| 26 | 13091204252 |
| 27 | 30433357644 |
| 28 | 70748973053 |
[1,5,16,43,107,257,607,1422,3318,7727,17978,41810, 97214,226014,525439,1221519,2839710,6601549, 15346765,35676927,82938821,192809396,448227496, 1042002541,2422362052,5631308596,13091204252, 30433357644,70748973053] |