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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 4 |
| 5 | 11 |
| 6 | 36 |
| 7 | 119 |
| 8 | 443 |
| 9 | 1718 |
| 10 | 7245 |
| 11 | 32313 |
| 12 | 153730 |
| 13 | 771677 |
| 14 | 4088053 |
| 15 | 22741818 |
| 16 | 132596893 |
| 17 | 807840501 |
| 18 | 5132194862 |
| 19 | 33924901021 |
| 20 | 232905225561 |
| 21 | 1657803862422 |
| 22 | 12215420390037 |
| 23 | 93042805475305 |
| 24 | 731622623516178 |
| 25 | 5931914758691917 |
| 26 | 49535825763153373 |
| 27 | 425606813712984146 |
| 28 | 3758735172560999933 |
| 29 | 34089943206777076429 |
| 30 | 317245175458777517030 |
[0,0,1,4,11,36,119,443,1718,7245,32313,153730, 771677,4088053,22741818,132596893,807840501, 5132194862,33924901021,232905225561,1657803862422, 12215420390037,93042805475305,731622623516178, 5931914758691917,49535825763153373, 425606813712984146,3758735172560999933, 34089943206777076429,317245175458777517030] |