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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 2 |
| 4 | 3 |
| 5 | 9 |
| 6 | 14 |
| 7 | 34 |
| 8 | 55 |
| 9 | 125 |
| 10 | 209 |
| 11 | 461 |
| 12 | 791 |
| 13 | 1715 |
| 14 | 3002 |
| 15 | 6434 |
| 16 | 11439 |
| 17 | 24309 |
| 18 | 43757 |
| 19 | 92377 |
| 20 | 167959 |
| 21 | 352715 |
| 22 | 646645 |
| 23 | 1352077 |
| 24 | 2496143 |
| 25 | 5200299 |
| 26 | 9657699 |
| 27 | 20058299 |
| 28 | 37442159 |
| 29 | 77558759 |
| 30 | 145422674 |
| 31 | 300540194 |
| 32 | 565722719 |
| 33 | 1166803109 |
| 34 | 2203961429 |
| 35 | 4537567649 |
[0,0,0,2,3,9,14,34,55,125,209,461,791,1715,3002, 6434,11439,24309,43757,92377,167959,352715,646645, 1352077,2496143,5200299,9657699,20058299,37442159, 77558759,145422674,300540194,565722719,1166803109, 2203961429,4537567649] |