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| n | a(n) |
|---|---|
| 4 | 1 |
| 5 | 10 |
| 6 | 67 |
| 7 | 379 |
| 8 | 1958 |
| 9 | 9576 |
| 10 | 45190 |
| 11 | 208084 |
| 12 | 941480 |
| 13 | 4204949 |
| 14 | 18597694 |
| 15 | 81635060 |
| 16 | 356220369 |
| 17 | 1547066801 |
| 18 | 6693361973 |
| 19 | 28868868733 |
| 20 | 124194904215 |
| 21 | 533156609953 |
| 22 | 2284722747583 |
| 23 | 9776008778375 |
| 24 | 41777089615201 |
| 25 | 178338353574365 |
| 26 | 760586650190997 |
[1,10,67,379,1958,9576,45190,208084,941480, 4204949,18597694,81635060,356220369,1547066801, 6693361973,28868868733,124194904215,533156609953, 2284722747583,9776008778375,41777089615201, 178338353574365,760586650190997] |