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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 15 |
| 3 | 205 |
| 4 | 4202 |
| 5 | 118096 |
| 6 | 4300364 |
| 7 | 195155304 |
| 8 | 10727473182 |
| 9 | 698874420944 |
| 10 | 53040545101942 |
| 11 | 4624423933685370 |
| 12 | 457851029540848580 |
| 13 | 50977215595819988320 |
| 14 | 6329927203532081983976 |
| 15 | 870296461701522595081624 |
| 16 | 131659595370255359745290076 |
[1,2,15,205,4202,118096,4300364,195155304, 10727473182,698874420944,53040545101942, 4624423933685370,457851029540848580, 50977215595819988320,6329927203532081983976, 870296461701522595081624, 131659595370255359745290076] |