The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 51 |
| 2 | 277 |
| 3 | 1436 |
| 4 | 6921 |
| 5 | 32468 |
| 6 | 147434 |
| 7 | 659392 |
| 8 | 2907273 |
| 9 | 12720102 |
| 10 | 55312482 |
| 11 | 239664411 |
| 12 | 1035761616 |
| 13 | 4469289143 |
| 14 | 19264431459 |
| 15 | 82983495781 |
| 16 | 357308047528 |
| 17 | 1538085137733 |
| 18 | 6619812032809 |
| 19 | 28488295966068 |
| 20 | 122591240597807 |
[51,277,1436,6921,32468,147434,659392,2907273, 12720102,55312482,239664411,1035761616,4469289143, 19264431459,82983495781,357308047528, 1538085137733,6619812032809,28488295966068, 122591240597807] |