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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 3 |
| 3 | 40 |
| 4 | 45 |
| 5 | 1 |
| 6 | 7 |
| 7 | 225 |
| 8 | 153 |
| 9 | 640 |
| 10 | 4851 |
| 11 | 6348 |
| 12 | 325 |
| 13 | 19474560 |
| 14 | 1 |
| 15 | 976 |
| 16 | 18513 |
| 17 | 1225 |
| 18 | 19 |
| 19 | 107747640000 |
| 20 | 81 |
| 21 | 1 |
| 22 | 23 |
| 23 | 245790720 |
| 24 | 49 |
| 25 | 2601 |
| 26 | 2133 |
| 27 | 3025 |
| 28 | 94221 |
| 29 | 56241820800 |
| 30 | 31 |
| 31 | 20063232 |
| 32 | 4225 |
| 33 | 15262600 |
| 34 | 4761 |
| 35 | 19236456 |
| 36 | 37 |
| 37 | 25462407801600 |
| 38 | 5929 |
| 39 | 2952832000 |
| 40 | 21921921 |
[1,2,3,40,45,1,7,225,153,640,4851,6348,325, 19474560,1,976,18513,1225,19,107747640000,81,1,23, 245790720,49,2601,2133,3025,94221,56241820800,31, 20063232,4225,15262600,4761,19236456,37, 25462407801600,5929,2952832000,21921921] |