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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 7 |
| 3 | 0 |
| 4 | 21 |
| 5 | 31 |
| 6 | 96 |
| 7 | 39 |
| 8 | 288 |
| 9 | 297 |
| 10 | 1833 |
| 11 | 297 |
| 12 | 5417 |
| 13 | 7977 |
| 14 | 24873 |
| 15 | 9513 |
| 16 | 75561 |
| 17 | 75049 |
| 18 | 468281 |
| 19 | 75025 |
| 20 | 1385813 |
| 21 | 2041215 |
| 22 | 6367120 |
| 23 | 2434455 |
| 24 | 19343128 |
| 25 | 19210577 |
| 26 | 119874897 |
| 27 | 19212113 |
| 28 | 354885969 |
| 29 | 522528081 |
| 30 | 1629824849 |
| 31 | 623321425 |
| 32 | 4951450961 |
| 33 | 4918683473 |
[1,1,7,0,21,31,96,39,288,297,1833,297,5417,7977, 24873,9513,75561,75049,468281,75025,1385813, 2041215,6367120,2434455,19343128,19210577, 119874897,19212113,354885969,522528081,1629824849, 623321425,4951450961,4918683473] |