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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 2 |
| 6 | 3 |
| 7 | 10 |
| 8 | 20 |
| 9 | 44 |
| 10 | 67 |
| 11 | 149 |
| 12 | 277 |
| 13 | 528 |
| 14 | 959 |
| 15 | 1673 |
| 16 | 3107 |
| 17 | 5572 |
| 18 | 9992 |
| 19 | 17801 |
| 20 | 31647 |
| 21 | 55379 |
| 22 | 98445 |
| 23 | 173288 |
| 24 | 305355 |
| 25 | 536709 |
| 26 | 943353 |
| 27 | 1655316 |
| 28 | 2900221 |
| 29 | 5088098 |
| 30 | 8916905 |
| 31 | 15624332 |
| 32 | 27368888 |
| 33 | 47935241 |
| 34 | 83939143 |
| 35 | 146974040 |
| 36 | 257277523 |
| 37 | 450432510 |
| 38 | 788487147 |
[0,0,0,0,1,2,3,10,20,44,67,149,277,528,959,1673, 3107,5572,9992,17801,31647,55379,98445,173288, 305355,536709,943353,1655316,2900221,5088098, 8916905,15624332,27368888,47935241,83939143, 146974040,257277523,450432510,788487147] |