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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 3 |
| 6 | 10 |
| 7 | 23 |
| 8 | 54 |
| 9 | 112 |
| 10 | 228 |
| 11 | 437 |
| 12 | 826 |
| 13 | 1499 |
| 14 | 2685 |
| 15 | 4688 |
| 16 | 8079 |
| 17 | 13668 |
| 18 | 22875 |
| 19 | 37738 |
| 20 | 61676 |
| 21 | 99672 |
| 22 | 159742 |
| 23 | 253681 |
| 24 | 399962 |
| 25 | 625741 |
| 26 | 972756 |
| 27 | 1502302 |
| 28 | 2306988 |
| 29 | 3522492 |
| 30 | 5351239 |
| 31 | 8088469 |
| 32 | 12170163 |
| 33 | 18229411 |
| 34 | 27192571 |
[0,0,0,1,3,10,23,54,112,228,437,826,1499,2685, 4688,8079,13668,22875,37738,61676,99672,159742, 253681,399962,625741,972756,1502302,2306988, 3522492,5351239,8088469,12170163,18229411, 27192571] |