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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 36 |
| 3 | 76 |
| 4 | 344 |
| 5 | 2178 |
| 6 | 15556 |
| 7 | 82386 |
| 8 | 479148 |
| 9 | 2894976 |
| 10 | 17686548 |
| 11 | 104720692 |
| 12 | 626126744 |
| 13 | 3760257066 |
| 14 | 22609447684 |
| 15 | 135448403466 |
| 16 | 812343844524 |
| 17 | 4874677265880 |
| 18 | 29255734010196 |
| 19 | 175501301390140 |
| 20 | 1052950222812440 |
[0,36,76,344,2178,15556,82386,479148,2894976, 17686548,104720692,626126744,3760257066, 22609447684,135448403466,812343844524, 4874677265880,29255734010196,175501301390140, 1052950222812440] |