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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 16 |
| 3 | 75 |
| 4 | 385 |
| 5 | 1971 |
| 6 | 10473 |
| 7 | 56139 |
| 8 | 305394 |
| 9 | 1674198 |
| 10 | 9245506 |
| 11 | 51325206 |
| 12 | 286210243 |
| 13 | 1601822505 |
| 14 | 8992732043 |
| 15 | 50619114252 |
| 16 | 285583525237 |
| 17 | 1614439389711 |
| 18 | 9142794839933 |
| 19 | 51858472602546 |
| 20 | 294559269778199 |
| 21 | 1675240507900632 |
| 22 | 9538522900076376 |
| 23 | 54367531265208579 |
| 24 | 310179797595736539 |
[1,3,16,75,385,1971,10473,56139,305394,1674198, 9245506,51325206,286210243,1601822505,8992732043, 50619114252,285583525237,1614439389711, 9142794839933,51858472602546,294559269778199, 1675240507900632,9538522900076376, 54367531265208579,310179797595736539] |