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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 8 |
| 3 | 153 |
| 4 | 4981 |
| 5 | 236970 |
| 6 | 15211158 |
| 7 | 1250791640 |
| 8 | 127078235560 |
| 9 | 15531504729378 |
| 10 | 2237017556966100 |
| 11 | 373533515381767037 |
| 12 | 71351421971134445583 |
| 13 | 15419725101750288678775 |
| 14 | 3734978285744386546427032 |
| 15 | 1005908662614385539285407741 |
| 16 | 299140901286981469075716747245 |
[1,1,8,153,4981,236970,15211158,1250791640, 127078235560,15531504729378,2237017556966100, 373533515381767037,71351421971134445583, 15419725101750288678775,3734978285744386546427032, 1005908662614385539285407741, 299140901286981469075716747245] |