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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 148 |
| 7 | 1459 |
| 8 | 7816 |
| 9 | 30252 |
| 10 | 94800 |
| 11 | 256782 |
| 12 | 617856 |
| 13 | 1366224 |
| 14 | 2795748 |
| 15 | 5412325 |
| 16 | 9923416 |
| 17 | 17486008 |
| 18 | 29560632 |
| 19 | 48570684 |
| 20 | 77244360 |
| 21 | 120061344 |
| 22 | 182023572 |
| 23 | 270840423 |
| 24 | 394457656 |
| 25 | 566591620 |
[0,0,0,0,0,148,1459,7816,30252,94800,256782, 617856,1366224,2795748,5412325,9923416,17486008, 29560632,48570684,77244360,120061344,182023572, 270840423,394457656,566591620] |