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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 40 |
| 3 | 430 |
| 4 | 5770 |
| 5 | 92590 |
| 6 | 1726940 |
| 7 | 36682200 |
| 8 | 873793620 |
| 9 | 23061929940 |
| 10 | 667868085360 |
| 11 | 21052931727240 |
| 12 | 717531427466280 |
| 13 | 26289935772108120 |
| 14 | 1030422613932910800 |
| 15 | 43018144091244322560 |
| 16 | 1905711682795871222160 |
| 17 | 89284805444478025826640 |
[1,5,40,430,5770,92590,1726940,36682200,873793620, 23061929940,667868085360,21052931727240, 717531427466280,26289935772108120, 1030422613932910800,43018144091244322560, 1905711682795871222160,89284805444478025826640] |