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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 5 |
| 3 | 32 |
| 4 | 237 |
| 5 | 1905 |
| 6 | 16160 |
| 7 | 142392 |
| 8 | 1290613 |
| 9 | 11955947 |
| 10 | 112697701 |
| 11 | 1077438356 |
| 12 | 10422562156 |
| 13 | 101827196684 |
| 14 | 1003312506776 |
| 15 | 9958506719664 |
| 16 | 99479743121349 |
| 17 | 999370184665407 |
| 18 | 10090067735619023 |
| 19 | 102330789530653912 |
| 20 | 1041997707624103589 |
| 21 | 10648963961114066129 |
[1,1,5,32,237,1905,16160,142392,1290613,11955947, 112697701,1077438356,10422562156,101827196684, 1003312506776,9958506719664,99479743121349, 999370184665407,10090067735619023, 102330789530653912,1041997707624103589, 10648963961114066129] |