| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 45 |
| 2 | 1080 |
| 3 | 18285 |
| 4 | 244260 |
| 5 | 2733804 |
| 6 | 26606745 |
| 7 | 230915656 |
| 8 | 1819708110 |
| 9 | 13198528010 |
| 10 | 89041203249 |
| 11 | 563420646090 |
| 12 | 3366705675744 |
| 13 | 19105222953420 |
| 14 | 103448715353372 |
| 15 | 536621238174195 |
| 16 | 2675953974595655 |
| 17 | 12866398610335149 |
| 18 | 59805282183021050 |
| 19 | 269356649381129943 |
| 20 | 1177903345233332970 |
| 21 | 5010462608512204473 |
| 22 | 20765528801742226455 |
[1,45,1080,18285,244260,2733804,26606745, 230915656,1819708110,13198528010,89041203249, 563420646090,3366705675744,19105222953420, 103448715353372,536621238174195,2675953974595655, 12866398610335149,59805282183021050, 269356649381129943,1177903345233332970, 5010462608512204473,20765528801742226455] |