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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 35 |
| 4 | 323 |
| 5 | 3679 |
| 6 | 49819 |
| 7 | 781465 |
| 8 | 13923545 |
| 9 | 277563617 |
| 10 | 6118251461 |
| 11 | 147715469131 |
| 12 | 3875706370315 |
| 13 | 109781717161375 |
| 14 | 3338229675519803 |
| 15 | 108443658227589329 |
| 16 | 3747688533281296049 |
| 17 | 137273241169036231105 |
| 18 | 5311844045472206624005 |
| 19 | 216505267421266611639667 |
| 20 | 9270689769095765333645651 |
[1,1,5,35,323,3679,49819,781465,13923545, 277563617,6118251461,147715469131,3875706370315, 109781717161375,3338229675519803, 108443658227589329,3747688533281296049, 137273241169036231105,5311844045472206624005, 216505267421266611639667, 9270689769095765333645651] |