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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 0 |
| 3 | 3 |
| 4 | 0 |
| 5 | 0 |
| 6 | 11 |
| 7 | 9 |
| 8 | 0 |
| 9 | 1 |
| 10 | 53 |
| 11 | 120 |
| 12 | 60 |
| 13 | 40 |
| 14 | 9 |
| 15 | 309 |
| 16 | 1410 |
| 17 | 1800 |
| 18 | 1590 |
| 19 | 885 |
| 20 | 216 |
| 21 | 2119 |
| 22 | 16560 |
| 23 | 39960 |
| 24 | 55120 |
| 25 | 52065 |
| 26 | 29016 |
| 27 | 7570 |
| 28 | 16687 |
| 29 | 202755 |
| 30 | 801780 |
| 31 | 1696555 |
| 32 | 2433165 |
| 33 | 2300403 |
| 34 | 1326850 |
| 35 | 357435 |
| 36 | 148329 |
| 37 | 2624496 |
| 38 | 15606360 |
| 39 | 48387024 |
| 40 | 99650670 |
| 41 | 141429456 |
| 42 | 135382464 |
| 43 | 79738800 |
| 44 | 22040361 |
| 45 | 1468457 |
| 46 | 36080100 |
| 47 | 304274880 |
| 48 | 1323453180 |
| 49 | 3760709526 |
| 50 | 7493549868 |
| 51 | 10570597800 |
| 52 | 10199809980 |
| 53 | 6103007505 |
| 54 | 1721632024 |
[1,1,0,3,0,0,11,9,0,1,53,120,60,40,9,309,1410, 1800,1590,885,216,2119,16560,39960,55120,52065, 29016,7570,16687,202755,801780,1696555,2433165, 2300403,1326850,357435,148329,2624496,15606360, 48387024,99650670,141429456,135382464,79738800, 22040361,1468457,36080100,304274880,1323453180, 3760709526,7493549868,10570597800,10199809980, 6103007505,1721632024] |