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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 11 |
| 6 | 24 |
| 7 | 57 |
| 8 | 141 |
| 9 | 349 |
| 10 | 871 |
| 11 | 2212 |
| 12 | 5688 |
| 13 | 14730 |
| 14 | 38403 |
| 15 | 100829 |
| 16 | 266333 |
| 17 | 706997 |
| 18 | 1885165 |
| 19 | 5047522 |
| 20 | 13565203 |
| 21 | 36578497 |
| 22 | 98934826 |
| 23 | 268342933 |
| 24 | 729709432 |
| 25 | 1989021256 |
| 26 | 5433518806 |
| 27 | 14873285506 |
| 28 | 40790118487 |
| 29 | 112064912455 |
[1,1,1,2,5,11,24,57,141,349,871,2212,5688,14730, 38403,100829,266333,706997,1885165,5047522, 13565203,36578497,98934826,268342933,729709432, 1989021256,5433518806,14873285506,40790118487, 112064912455] |