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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 8 |
| 3 | 36 |
| 4 | 120 |
| 5 | 331 |
| 6 | 801 |
| 7 | 1761 |
| 8 | 3597 |
| 9 | 6931 |
| 10 | 12737 |
| 11 | 22506 |
| 12 | 38479 |
| 13 | 63974 |
| 14 | 103843 |
| 15 | 165109 |
| 16 | 257852 |
| 17 | 396439 |
| 18 | 601229 |
| 19 | 900934 |
| 20 | 1335886 |
| 21 | 1962555 |
| 22 | 2859794 |
| 23 | 4137468 |
| 24 | 5948374 |
| 25 | 8504704 |
| 26 | 12100779 |
| 27 | 17144439 |
| 28 | 24200381 |
| 29 | 34049989 |
| 30 | 47773928 |
| 31 | 66866159 |
| 32 | 93391324 |
| 33 | 130201994 |
[0,1,8,36,120,331,801,1761,3597,6931,12737,22506, 38479,63974,103843,165109,257852,396439,601229, 900934,1335886,1962555,2859794,4137468,5948374, 8504704,12100779,17144439,24200381,34049989, 47773928,66866159,93391324,130201994] |