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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 5 |
| 4 | 5 |
| 5 | 13 |
| 6 | 203 |
| 7 | 877 |
| 8 | 1035 |
| 9 | 21147 |
| 10 | 115975 |
| 11 | 339285 |
| 12 | 4213597 |
| 13 | 27644437 |
| 14 | 95449661 |
| 15 | 1382958545 |
| 16 | 10480142147 |
| 17 | 6905405817 |
| 18 | 682076806159 |
| 19 | 5832742205057 |
| 20 | 12931039558843 |
| 21 | 474869816156751 |
| 22 | 4506715738447323 |
| 23 | 22076002927542173 |
| 24 | 445958869294805289 |
| 25 | 4638590332229999353 |
[1,1,1,5,5,13,203,877,1035,21147,115975,339285, 4213597,27644437,95449661,1382958545,10480142147, 6905405817,682076806159,5832742205057, 12931039558843,474869816156751,4506715738447323, 22076002927542173,445958869294805289, 4638590332229999353] |