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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 55 |
| 4 | 1004 |
| 5 | 27456 |
| 6 | 1077657 |
| 7 | 59699950 |
| 8 | 3944644671 |
| 9 | 319905929418 |
| 10 | 32390662046661 |
| 11 | 4181039787994506 |
| 12 | 602128996908467070 |
| 13 | 102537208988632300118 |
| 14 | 20497804459093071390108 |
| 15 | 4978144718604701947160364 |
| 16 | 1232227300264551117529973052 |
| 17 | 335016989869301170468736520008 |
[1,1,5,55,1004,27456,1077657,59699950,3944644671, 319905929418,32390662046661,4181039787994506, 602128996908467070,102537208988632300118, 20497804459093071390108,4978144718604701947160364, 1232227300264551117529973052, 335016989869301170468736520008] |