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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 1 |
| 7 | 6 |
| 8 | 25 |
| 9 | 55 |
| 10 | 115 |
| 11 | 197 |
| 12 | 324 |
| 13 | 491 |
| 14 | 727 |
| 15 | 1020 |
| 16 | 1407 |
| 17 | 1882 |
| 18 | 2476 |
| 19 | 3181 |
| 20 | 4049 |
| 21 | 5054 |
| 22 | 6257 |
| 23 | 7644 |
| 24 | 9263 |
| 25 | 11103 |
| 26 | 13230 |
| 27 | 15614 |
| 28 | 18334 |
| 29 | 21373 |
| 30 | 24792 |
| 31 | 28572 |
| 32 | 32807 |
| 33 | 37453 |
| 34 | 42608 |
| 35 | 48252 |
| 36 | 54458 |
| 37 | 61209 |
| 38 | 68613 |
| 39 | 76617 |
| 40 | 85342 |
| 41 | 94760 |
| 42 | 104962 |
| 43 | 115923 |
| 44 | 127774 |
| 45 | 140453 |
| 46 | 154095 |
| 47 | 168674 |
| 48 | 184293 |
| 49 | 200924 |
| 50 | 218717 |
| 51 | 237596 |
| 52 | 257724 |
| 53 | 279067 |
| 54 | 301741 |
| 55 | 325715 |
[0,0,0,0,0,1,6,25,55,115,197,324,491,727,1020, 1407,1882,2476,3181,4049,5054,6257,7644,9263, 11103,13230,15614,18334,21373,24792,28572,32807, 37453,42608,48252,54458,61209,68613,76617,85342, 94760,104962,115923,127774,140453,154095,168674, 184293,200924,218717,237596,257724,279067,301741, 325715] |