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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 5 |
| 5 | 16 |
| 6 | 78 |
| 7 | 588 |
| 8 | 8047 |
| 9 | 205914 |
| 10 | 10014882 |
| 11 | 912908876 |
| 12 | 154636289460 |
| 13 | 48597794716736 |
| 14 | 28412296651708628 |
| 15 | 31024938435794151088 |
| 16 | 63533059372622888758054 |
| 17 | 244916078509480823407040988 |
| 18 | 1783406527599529094009748567708 |
| 19 | 24605674623474428415849066062642456 |
[1,1,1,2,5,16,78,588,8047,205914,10014882, 912908876,154636289460,48597794716736, 28412296651708628,31024938435794151088, 63533059372622888758054, 244916078509480823407040988, 1783406527599529094009748567708, 24605674623474428415849066062642456] |