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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 42 |
| 4 | 553 |
| 5 | 9757 |
| 6 | 213989 |
| 7 | 5577285 |
| 8 | 167819725 |
| 9 | 5715066723 |
| 10 | 217100774130 |
| 11 | 9097820151376 |
| 12 | 416870148834739 |
| 13 | 20734141087348929 |
| 14 | 1112567525238708108 |
| 15 | 64067000804518722936 |
| 16 | 3941130502347547574782 |
| 17 | 257950869129924123671281 |
| 18 | 17899157911139617070534480 |
| 19 | 1312572773247815201019870104 |
| 20 | 101429898156047011931583837037 |
| 21 | 8238300763728888616466106146271 |
| 22 | 701648737726537575830481016280283 |
[1,1,5,42,553,9757,213989,5577285,167819725, 5715066723,217100774130,9097820151376, 416870148834739,20734141087348929, 1112567525238708108,64067000804518722936, 3941130502347547574782,257950869129924123671281, 17899157911139617070534480, 1312572773247815201019870104, 101429898156047011931583837037, 8238300763728888616466106146271, 701648737726537575830481016280283] |