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| n | a(n) |
|---|---|
| 12 | 1 |
| 13 | 13 |
| 14 | 157 |
| 15 | 1435 |
| 16 | 12691 |
| 17 | 101052 |
| 18 | 786117 |
| 19 | 5851328 |
| 20 | 42963267 |
| 21 | 308461565 |
| 22 | 2200106730 |
| 23 | 15523160964 |
| 24 | 109276194539 |
| 25 | 765893045981 |
| 26 | 5370138366217 |
| 27 | 37632618874052 |
| 28 | 264319585797339 |
| 29 | 1859912789719007 |
| 30 | 13134267968029320 |
| 31 | 93063077962184496 |
| 32 | 662346852662103869 |
[1,13,157,1435,12691,101052,786117,5851328, 42963267,308461565,2200106730,15523160964, 109276194539,765893045981,5370138366217, 37632618874052,264319585797339,1859912789719007, 13134267968029320,93063077962184496, 662346852662103869] |