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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 5 |
| 5 | 24 |
| 6 | 136 |
| 7 | 1007 |
| 8 | 12270 |
| 9 | 274515 |
| 10 | 12004839 |
| 11 | 1018997154 |
| 12 | 165091170991 |
| 13 | 50502031364294 |
| 14 | 29054155657226889 |
| 15 | 31426485969804288254 |
| 16 | 64001015704527557845023 |
| 17 | 245935864153532932683596813 |
| 18 | 1787577725145611700547877883649 |
| 19 | 24637809253125004524383007490657239 |
[0,0,1,5,24,136,1007,12270,274515,12004839, 1018997154,165091170991,50502031364294, 29054155657226889,31426485969804288254, 64001015704527557845023, 245935864153532932683596813, 1787577725145611700547877883649, 24637809253125004524383007490657239] |