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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 29 |
| 4 | 132 |
| 5 | 637 |
| 6 | 3200 |
| 7 | 16554 |
| 8 | 87576 |
| 9 | 471570 |
| 10 | 2575885 |
| 11 | 14238003 |
| 12 | 79487023 |
| 13 | 447540164 |
| 14 | 2538352756 |
| 15 | 14489355578 |
| 16 | 83174465721 |
| 17 | 479842193453 |
| 18 | 2780625587824 |
| 19 | 16178040713569 |
| 20 | 94467163314370 |
| 21 | 553430174678595 |
| 22 | 3251969073086610 |
| 23 | 19161172609833540 |
| 24 | 113186247571818096 |
[1,2,7,29,132,637,3200,16554,87576,471570,2575885, 14238003,79487023,447540164,2538352756, 14489355578,83174465721,479842193453, 2780625587824,16178040713569,94467163314370, 553430174678595,3251969073086610, 19161172609833540,113186247571818096] |