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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 304 |
| 5 | 10741 |
| 6 | 127960 |
| 7 | 870589 |
| 8 | 4197456 |
| 9 | 16005187 |
| 10 | 51439096 |
| 11 | 145085447 |
| 12 | 369074128 |
| 13 | 863338777 |
| 14 | 1883786680 |
| 15 | 3875953561 |
| 16 | 7583888944 |
| 17 | 14206566327 |
| 18 | 25617069208 |
| 19 | 44663199283 |
| 20 | 75572017136 |
| 21 | 124485188701 |
| 22 | 200156902936 |
| 23 | 314851577749 |
| 24 | 485484612496 |
| 25 | 735056106571 |
| 26 | 1094434774968 |
[0,0,1,304,10741,127960,870589,4197456,16005187, 51439096,145085447,369074128,863338777,1883786680, 3875953561,7583888944,14206566327,25617069208, 44663199283,75572017136,124485188701,200156902936, 314851577749,485484612496,735056106571, 1094434774968] |