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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 13 |
| 4 | 91 |
| 5 | 1119 |
| 6 | 23235 |
| 7 | 879361 |
| 8 | 55447631 |
| 9 | 6274018595 |
| 10 | 1192773105789 |
| 11 | 400761393446831 |
| 12 | 231147252957096671 |
| 13 | 231434829013884972151 |
| 14 | 406000810484101907916927 |
| 15 | 1216355994930424625967455929 |
| 16 | 6474418584620388915674215696687 |
| 17 | 58229572245447428847208518694227279 |
| 18 | 936163501254507409972001699357677028097 |
| 19 | 25330794407893091120626418701416294765820223 |
| 20 | 1224635875718403110628189182372406488768960029317 |
[1,1,3,13,91,1119,23235,879361,55447631, 6274018595,1192773105789,400761393446831, 231147252957096671,231434829013884972151, 406000810484101907916927, 1216355994930424625967455929, 6474418584620388915674215696687, 58229572245447428847208518694227279, 936163501254507409972001699357677028097, 25330794407893091120626418701416294765820223, 1224635875718403110628189182372406488768960029317] |