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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 32 |
| 3 | 153 |
| 4 | 1145 |
| 5 | 5677 |
| 6 | 37641 |
| 7 | 184685 |
| 8 | 1047862 |
| 9 | 5196410 |
| 10 | 26935148 |
| 11 | 129702476 |
| 12 | 638028933 |
| 13 | 2987297287 |
| 14 | 14055935617 |
| 15 | 64139004752 |
| 16 | 291595380989 |
| 17 | 1296984485909 |
| 18 | 5732084828019 |
| 19 | 24910785830408 |
| 20 | 107411267744602 |
| 21 | 457008372687439 |
| 22 | 1928413165110846 |
| 23 | 8046605441623654 |
[1,1,32,153,1145,5677,37641,184685,1047862, 5196410,26935148,129702476,638028933,2987297287, 14055935617,64139004752,291595380989, 1296984485909,5732084828019,24910785830408, 107411267744602,457008372687439,1928413165110846, 8046605441623654] |