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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 1 |
| 3 | 4 |
| 4 | 11 |
| 5 | 25 |
| 6 | 55 |
| 7 | 116 |
| 8 | 245 |
| 9 | 505 |
| 10 | 1026 |
| 11 | 2030 |
| 12 | 3936 |
| 13 | 7450 |
| 14 | 13837 |
| 15 | 25210 |
| 16 | 45206 |
| 17 | 79831 |
| 18 | 139136 |
| 19 | 239471 |
| 20 | 407582 |
| 21 | 686346 |
| 22 | 1144532 |
| 23 | 1890837 |
| 24 | 3096692 |
| 25 | 5029412 |
| 26 | 8104448 |
| 27 | 12961576 |
| 28 | 20582130 |
| 29 | 32459992 |
| 30 | 50859769 |
| 31 | 79192204 |
| 32 | 122572743 |
[0,0,1,4,11,25,55,116,245,505,1026,2030,3936,7450, 13837,25210,45206,79831,139136,239471,407582, 686346,1144532,1890837,3096692,5029412,8104448, 12961576,20582130,32459992,50859769,79192204, 122572743] |