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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 3 |
| 5 | 7 |
| 6 | 19 |
| 7 | 37 |
| 8 | 99 |
| 9 | 586 |
| 10 | 1144 |
| 11 | 5452 |
| 12 | 22610 |
| 13 | 112227 |
| 14 | 482885 |
| 15 | 1978069 |
| 16 | 8394471 |
| 17 | 34646088 |
| 18 | 140372604 |
| 19 | 572795825 |
| 20 | 2320299903 |
| 21 | 9330259482 |
| 22 | 37549205868 |
| 23 | 150740987631 |
| 24 | 603268047310 |
| 25 | 2413279250137 |
| 26 | 9643525728588 |
| 27 | 38481447864172 |
[1,3,7,19,37,99,586,1144,5452,22610,112227,482885, 1978069,8394471,34646088,140372604,572795825, 2320299903,9330259482,37549205868,150740987631, 603268047310,2413279250137,9643525728588, 38481447864172] |