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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 40 |
| 4 | 434 |
| 5 | 5901 |
| 6 | 95997 |
| 7 | 1812525 |
| 8 | 38875265 |
| 9 | 932135347 |
| 10 | 24678938063 |
| 11 | 714385754446 |
| 12 | 22428656766320 |
| 13 | 758632387171075 |
| 14 | 27489135956517315 |
| 15 | 1061913384743418360 |
| 16 | 43550536908458238570 |
| 17 | 1889211624465639489675 |
| 18 | 86406059558668152123975 |
| 19 | 4154647501527354507485040 |
[1,1,5,40,434,5901,95997,1812525,38875265, 932135347,24678938063,714385754446,22428656766320, 758632387171075,27489135956517315, 1061913384743418360,43550536908458238570, 1889211624465639489675,86406059558668152123975, 4154647501527354507485040] |