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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 4 |
| 3 | 38 |
| 4 | 532 |
| 5 | 9329 |
| 6 | 190312 |
| 7 | 4340296 |
| 8 | 108043128 |
| 9 | 2890318936 |
| 10 | 82209697588 |
| 11 | 2467155342740 |
| 12 | 77676395612884 |
| 13 | 2554497746708964 |
| 14 | 87449858261161216 |
| 15 | 3107829518797739032 |
| 16 | 114399270654847628768 |
| 17 | 4353537522757357068296 |
[1,1,4,38,532,9329,190312,4340296,108043128, 2890318936,82209697588,2467155342740, 77676395612884,2554497746708964,87449858261161216, 3107829518797739032,114399270654847628768, 4353537522757357068296] |