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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 3 |
| 3 | 32 |
| 4 | 506 |
| 5 | 11254 |
| 6 | 319486 |
| 7 | 11063352 |
| 8 | 452075928 |
| 9 | 21295486272 |
| 10 | 1136180493504 |
| 11 | 67720154888352 |
| 12 | 4459760039965248 |
| 13 | 321592207168637664 |
| 14 | 25201588848786782688 |
| 15 | 2132592146864957906688 |
| 16 | 193806614782424556184320 |
| 17 | 18825630812739265968357120 |
[0,1,3,32,506,11254,319486,11063352,452075928, 21295486272,1136180493504,67720154888352, 4459760039965248,321592207168637664, 25201588848786782688,2132592146864957906688, 193806614782424556184320, 18825630812739265968357120] |