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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 3 |
| 3 | 12 |
| 4 | 30 |
| 5 | 27 |
| 6 | 66 |
| 7 | 141 |
| 8 | 111 |
| 9 | 255 |
| 10 | 513 |
| 11 | 378 |
| 12 | 903 |
| 13 | 1815 |
| 14 | 1356 |
| 15 | 2970 |
| 16 | 5727 |
| 17 | 4131 |
| 18 | 8571 |
| 19 | 15882 |
| 20 | 10881 |
| 21 | 23001 |
| 22 | 42417 |
| 23 | 29106 |
| 24 | 59763 |
| 25 | 108165 |
| 26 | 73500 |
| 27 | 145164 |
| 28 | 255831 |
| 29 | 167643 |
| 30 | 333693 |
| 31 | 585258 |
| 32 | 382053 |
| 33 | 751059 |
| 34 | 1302966 |
| 35 | 849339 |
| 36 | 1623009 |
| 37 | 2762349 |
[1,3,3,12,30,27,66,141,111,255,513,378,903,1815, 1356,2970,5727,4131,8571,15882,10881,23001,42417, 29106,59763,108165,73500,145164,255831,167643, 333693,585258,382053,751059,1302966,849339, 1623009,2762349] |