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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 12 |
| 6 | 25 |
| 7 | 77 |
| 8 | 215 |
| 9 | 511 |
| 10 | 1466 |
| 11 | 4610 |
| 12 | 12680 |
| 13 | 35579 |
| 14 | 113158 |
| 15 | 344542 |
| 16 | 997244 |
| 17 | 3112862 |
| 18 | 9956308 |
| 19 | 30277199 |
| 20 | 93800266 |
| 21 | 303919846 |
| 22 | 963863561 |
| 23 | 3017836845 |
| 24 | 9766363338 |
| 25 | 31766793517 |
| 26 | 101462348434 |
| 27 | 328277090248 |
| 28 | 1079653283803 |
| 29 | 3516292489624 |
| 30 | 11439613075930 |
| 31 | 37768544363774 |
| 32 | 124746380740174 |
[1,1,1,2,6,12,25,77,215,511,1466,4610,12680,35579, 113158,344542,997244,3112862,9956308,30277199, 93800266,303919846,963863561,3017836845, 9766363338,31766793517,101462348434,328277090248, 1079653283803,3516292489624,11439613075930, 37768544363774,124746380740174] |