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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 3 |
| 4 | 10 |
| 5 | 20 |
| 6 | 68 |
| 7 | 147 |
| 8 | 530 |
| 9 | 1224 |
| 10 | 4408 |
| 11 | 10516 |
| 12 | 39378 |
| 13 | 97474 |
| 14 | 365038 |
| 15 | 920535 |
| 16 | 3501858 |
| 17 | 9009592 |
| 18 | 34248844 |
| 19 | 89167304 |
| 20 | 343038006 |
| 21 | 905754654 |
| 22 | 3484015834 |
| 23 | 9277353140 |
| 24 | 35924495108 |
| 25 | 96578927300 |
| 26 | 373891285428 |
| 27 | 1011485913642 |
| 28 | 3936897107170 |
| 29 | 10729182442150 |
| 30 | 41760445053660 |
| 31 | 114370464498523 |
| 32 | 446706120848602 |
[1,1,2,3,10,20,68,147,530,1224,4408,10516,39378, 97474,365038,920535,3501858,9009592,34248844, 89167304,343038006,905754654,3484015834, 9277353140,35924495108,96578927300,373891285428, 1011485913642,3936897107170,10729182442150, 41760445053660,114370464498523,446706120848602] |