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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 64 |
| 3 | 2930 |
| 4 | 115417 |
| 5 | 4715043 |
| 6 | 192788993 |
| 7 | 7888216533 |
| 8 | 322723834959 |
| 9 | 13203608881221 |
| 10 | 540203150208573 |
| 11 | 22101534579211095 |
| 12 | 904249026745794715 |
| 13 | 36995912673327194833 |
| 14 | 1513629078095632460534 |
| 15 | 61927733346071816062294 |
[0,64,2930,115417,4715043,192788993,7888216533, 322723834959,13203608881221,540203150208573, 22101534579211095,904249026745794715, 36995912673327194833,1513629078095632460534, 61927733346071816062294] |