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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 5 |
| 3 | 37 |
| 4 | 373 |
| 5 | 4761 |
| 6 | 73601 |
| 7 | 1336609 |
| 8 | 27888281 |
| 9 | 657386305 |
| 10 | 17276807089 |
| 11 | 500876786301 |
| 12 | 15879053677697 |
| 13 | 546470462226313 |
| 14 | 20288935994319929 |
| 15 | 808320431258439121 |
| 16 | 34397370632215764001 |
| 17 | 1557106493482564625793 |
| 18 | 74713970491718324746529 |
| 19 | 3787792171563440619543133 |
| 20 | 202314171910557294992453009 |
[0,1,5,37,373,4761,73601,1336609,27888281, 657386305,17276807089,500876786301,15879053677697, 546470462226313,20288935994319929, 808320431258439121,34397370632215764001, 1557106493482564625793,74713970491718324746529, 3787792171563440619543133, 202314171910557294992453009] |