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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 0 |
| 2 | 0 |
| 3 | 1 |
| 4 | 2 |
| 5 | 4 |
| 6 | 9 |
| 7 | 38 |
| 8 | 308 |
| 9 | 4937 |
| 10 | 316006 |
| 11 | 161795380 |
| 12 | 1325427757897 |
| 13 | 694905868332618342 |
| 14 | 186537373642942364470529332 |
| 15 | 410200022670422956346283949740775609161 |
| 16 | 472928427326946774459561651845917849178636866326243365478 |
[0,0,0,1,2,4,9,38,308,4937,316006,161795380, 1325427757897,694905868332618342, 186537373642942364470529332, 410200022670422956346283949740775609161, 47292842732694677445956165184591784917863686632624\ 3365478] |