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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 5 |
| 7 | 36 |
| 8 | 225 |
| 9 | 1453 |
| 10 | 9228 |
| 11 | 58701 |
| 12 | 372695 |
| 13 | 2370155 |
| 14 | 15117459 |
| 15 | 96868355 |
| 16 | 624326820 |
| 17 | 4051597971 |
| 18 | 26496771687 |
| 19 | 174749567296 |
| 20 | 1162909625384 |
| 21 | 7812487626519 |
| 22 | 53005074235282 |
| 23 | 363305517314289 |
| 24 | 2516343623698964 |
| 25 | 17615995074375601 |
| 26 | 124669825295709879 |
| 27 | 892060223018406365 |
[1,5,36,225,1453,9228,58701,372695,2370155, 15117459,96868355,624326820,4051597971, 26496771687,174749567296,1162909625384, 7812487626519,53005074235282,363305517314289, 2516343623698964,17615995074375601, 124669825295709879,892060223018406365] |