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| n | a(n) |
|---|---|
| 15 | 8 |
| 16 | 73 |
| 17 | 429 |
| 18 | 1945 |
| 19 | 7465 |
| 20 | 25317 |
| 21 | 78068 |
| 22 | 222963 |
| 23 | 597644 |
| 24 | 1518370 |
| 25 | 3683950 |
| 26 | 8586866 |
| 27 | 19320391 |
| 28 | 42127208 |
| 29 | 89307361 |
| 30 | 184578961 |
| 31 | 372786467 |
| 32 | 737212357 |
| 33 | 1429992711 |
| 34 | 2724852920 |
| 35 | 5107392644 |
| 36 | 9427895421 |
| 37 | 17157142969 |
| 38 | 30810379849 |
| 39 | 54643242181 |
| 40 | 95783964110 |
| 41 | 166059755226 |
[8,73,429,1945,7465,25317,78068,222963,597644, 1518370,3683950,8586866,19320391,42127208, 89307361,184578961,372786467,737212357,1429992711, 2724852920,5107392644,9427895421,17157142969, 30810379849,54643242181,95783964110,166059755226] |