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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 36 |
| 4 | 325 |
| 5 | 3468 |
| 6 | 42519 |
| 7 | 590268 |
| 8 | 9201740 |
| 9 | 160150252 |
| 10 | 3095440553 |
| 11 | 66068011710 |
| 12 | 1547572760559 |
| 13 | 39529002357409 |
| 14 | 1094096683131616 |
| 15 | 32622859912512090 |
| 16 | 1042350065213470532 |
| 17 | 35521574976088978133 |
| 18 | 1285782300453328211074 |
| 19 | 49256935742079848796102 |
[1,1,5,36,325,3468,42519,590268,9201740,160150252, 3095440553,66068011710,1547572760559, 39529002357409,1094096683131616,32622859912512090, 1042350065213470532,35521574976088978133, 1285782300453328211074,49256935742079848796102] |