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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 3 |
| 5 | 4 |
| 6 | 15 |
| 7 | 20 |
| 8 | 52 |
| 9 | 83 |
| 10 | 163 |
| 11 | 246 |
| 12 | 501 |
| 13 | 727 |
| 14 | 1295 |
| 15 | 1994 |
| 16 | 3375 |
| 17 | 4969 |
| 18 | 8267 |
| 19 | 12036 |
| 20 | 19287 |
| 21 | 28270 |
| 22 | 43511 |
| 23 | 62799 |
| 24 | 96364 |
| 25 | 137358 |
| 26 | 204388 |
| 27 | 291607 |
| 28 | 427446 |
| 29 | 601257 |
| 30 | 874088 |
| 31 | 1218524 |
| 32 | 1743989 |
| 33 | 2424096 |
| 34 | 3422084 |
| 35 | 4718626 |
| 36 | 6622937 |
| 37 | 9053800 |
| 38 | 12559895 |
| 39 | 17112883 |
[0,0,0,1,3,4,15,20,52,83,163,246,501,727,1295, 1994,3375,4969,8267,12036,19287,28270,43511,62799, 96364,137358,204388,291607,427446,601257,874088, 1218524,1743989,2424096,3422084,4718626,6622937, 9053800,12559895,17112883] |