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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 10 |
| 2 | 264 |
| 3 | 2052 |
| 4 | 9280 |
| 5 | 30750 |
| 6 | 83160 |
| 7 | 194824 |
| 8 | 410112 |
| 9 | 794610 |
| 10 | 1441000 |
| 11 | 2475660 |
| 12 | 4065984 |
| 13 | 6428422 |
| 14 | 9837240 |
| 15 | 14634000 |
| 16 | 21237760 |
| 17 | 30155994 |
| 18 | 41996232 |
| 19 | 57478420 |
| 20 | 77448000 |
| 21 | 102889710 |
| 22 | 134942104 |
| 23 | 174912792 |
| 24 | 224294400 |
| 25 | 284781250 |
| 26 | 358286760 |
| 27 | 446961564 |
| 28 | 553212352 |
[0,10,264,2052,9280,30750,83160,194824,410112, 794610,1441000,2475660,4065984,6428422,9837240, 14634000,21237760,30155994,41996232,57478420, 77448000,102889710,134942104,174912792,224294400, 284781250,358286760,446961564,553212352] |