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| n | a(n) |
|---|---|
| 6 | 1 |
| 7 | 13 |
| 8 | 104 |
| 9 | 663 |
| 10 | 3705 |
| 11 | 19019 |
| 12 | 92092 |
| 13 | 427570 |
| 14 | 1924065 |
| 15 | 8454225 |
| 16 | 36463440 |
| 17 | 154969620 |
| 18 | 650872404 |
| 19 | 2707475148 |
| 20 | 11173706960 |
| 21 | 45812198536 |
| 22 | 186803188858 |
| 23 | 758201178306 |
| 24 | 3065415516592 |
| 25 | 12352414499425 |
| 26 | 49634247352235 |
| 27 | 198954083924505 |
| 28 | 795816335698020 |
| 29 | 3177498557750790 |
[1,13,104,663,3705,19019,92092,427570,1924065, 8454225,36463440,154969620,650872404,2707475148, 11173706960,45812198536,186803188858,758201178306, 3065415516592,12352414499425,49634247352235, 198954083924505,795816335698020,3177498557750790] |