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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 136 |
| 4 | 1326 |
| 5 | 8160 |
| 6 | 31552 |
| 7 | 88128 |
| 8 | 240618 |
| 9 | 658784 |
| 10 | 1452480 |
| 11 | 2622216 |
| 12 | 5030028 |
| 13 | 10390944 |
| 14 | 18128256 |
| 15 | 26822464 |
| 16 | 43527174 |
| 17 | 77769696 |
| 18 | 119299200 |
| 19 | 157895592 |
| 20 | 232127928 |
| 21 | 379052672 |
| 22 | 537564480 |
| 23 | 662425536 |
| 24 | 910537442 |
| 25 | 1402281312 |
| 26 | 1881950592 |
| 27 | 2201578336 |
| 28 | 2894860164 |
| 29 | 4268628192 |
| 30 | 5501926784 |
[1,0,0,136,1326,8160,31552,88128,240618,658784, 1452480,2622216,5030028,10390944,18128256, 26822464,43527174,77769696,119299200,157895592, 232127928,379052672,537564480,662425536,910537442, 1402281312,1881950592,2201578336,2894860164, 4268628192,5501926784] |