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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 76 |
| 5 | 629 |
| 6 | 2820 |
| 7 | 9767 |
| 8 | 26272 |
| 9 | 63162 |
| 10 | 135504 |
| 11 | 269334 |
| 12 | 489204 |
| 13 | 870943 |
| 14 | 1447460 |
| 15 | 2319069 |
| 16 | 3613088 |
| 17 | 5496580 |
| 18 | 8046288 |
| 19 | 11646108 |
| 20 | 16349868 |
| 21 | 22751289 |
| 22 | 31151020 |
| 23 | 41928083 |
| 24 | 55298280 |
| 25 | 72845822 |
| 26 | 94565584 |
| 27 | 121269906 |
| 28 | 154010268 |
| 29 | 194468499 |
[0,0,0,76,629,2820,9767,26272,63162,135504,269334, 489204,870943,1447460,2319069,3613088,5496580, 8046288,11646108,16349868,22751289,31151020, 41928083,55298280,72845822,94565584,121269906, 154010268,194468499] |