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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 74 |
| 2 | 2701 |
| 3 | 64824 |
| 4 | 1150626 |
| 5 | 16108764 |
| 6 | 185250786 |
| 7 | 1799579064 |
| 8 | 15071474661 |
| 9 | 110524147514 |
| 10 | 718406958841 |
| 11 | 4179822305984 |
| 12 | 21944067106416 |
| 13 | 104656320045984 |
| 14 | 456002537343216 |
| 15 | 1824010149372864 |
| 16 | 6726037425812436 |
| 17 | 22947657099830664 |
| 18 | 72667580816130436 |
[1,74,2701,64824,1150626,16108764,185250786, 1799579064,15071474661,110524147514,718406958841, 4179822305984,21944067106416,104656320045984, 456002537343216,1824010149372864,6726037425812436, 22947657099830664,72667580816130436] |