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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 0 |
| 6 | 0 |
| 7 | 0 |
| 8 | 0 |
| 9 | 2170 |
| 10 | 11718 |
| 11 | 32382 |
| 12 | 140322 |
| 13 | 628866 |
| 14 | 2245950 |
| 15 | 7302603 |
| 16 | 21907809 |
| 17 | 60355638 |
| 18 | 154242186 |
| 19 | 365056650 |
| 20 | 803124630 |
| 21 | 1648195230 |
| 22 | 3146554530 |
| 23 | 5596735032 |
| 24 | 9327891720 |
| 25 | 14579965764 |
| 26 | 21309180732 |
[1,0,0,0,0,0,0,0,0,2170,11718,32382,140322,628866, 2245950,7302603,21907809,60355638,154242186, 365056650,803124630,1648195230,3146554530, 5596735032,9327891720,14579965764,21309180732] |