The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 21 |
| 2 | 286 |
| 3 | 3581 |
| 4 | 44783 |
| 5 | 565149 |
| 6 | 7121315 |
| 7 | 89713772 |
| 8 | 1130293195 |
| 9 | 14240708558 |
| 10 | 179419300176 |
| 11 | 2260512981540 |
| 12 | 28480330069267 |
| 13 | 358825298187419 |
| 14 | 4520860415119973 |
| 15 | 56958579395700728 |
| 16 | 717624409759413294 |
[21,286,3581,44783,565149,7121315,89713772, 1130293195,14240708558,179419300176,2260512981540, 28480330069267,358825298187419,4520860415119973, 56958579395700728,717624409759413294] |