| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 3 |
| 5 | 6 |
| 6 | 21 |
| 7 | 36 |
| 8 | 93 |
| 9 | 150 |
| 10 | 345 |
| 11 | 540 |
| 12 | 1173 |
| 13 | 1806 |
| 14 | 3801 |
| 15 | 5796 |
| 16 | 11973 |
| 17 | 18150 |
| 18 | 37065 |
| 19 | 55980 |
| 20 | 113493 |
| 21 | 171006 |
| 22 | 345081 |
| 23 | 519156 |
| 24 | 1044453 |
| 25 | 1569750 |
| 26 | 3151785 |
| 27 | 4733820 |
| 28 | 9492213 |
| 29 | 14250606 |
| 30 | 28550361 |
| 31 | 42850116 |
| 32 | 85798533 |
| 33 | 128746950 |
| 34 | 257690505 |
| 35 | 386634060 |
| 36 | 773661333 |
[0,0,0,3,6,21,36,93,150,345,540,1173,1806,3801, 5796,11973,18150,37065,55980,113493,171006,345081, 519156,1044453,1569750,3151785,4733820,9492213, 14250606,28550361,42850116,85798533,128746950, 257690505,386634060,773661333] |