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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 50 |
| 3 | 2354 |
| 4 | 110595 |
| 5 | 5195620 |
| 6 | 244083556 |
| 7 | 11466731525 |
| 8 | 538692298134 |
| 9 | 25307071280790 |
| 10 | 1188893657899015 |
| 11 | 55852694849972936 |
| 12 | 2623887764290829000 |
| 13 | 123266872226818990089 |
| 14 | 5790919106896201705210 |
| 15 | 272049931151894661154810 |
[0,1,50,2354,110595,5195620,244083556,11466731525, 538692298134,25307071280790,1188893657899015, 55852694849972936,2623887764290829000, 123266872226818990089,5790919106896201705210, 272049931151894661154810] |