The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 28 |
| 4 | 257 |
| 5 | 3126 |
| 6 | 46688 |
| 7 | 823544 |
| 8 | 16777217 |
| 9 | 387420490 |
| 10 | 10000003130 |
| 11 | 285311670612 |
| 12 | 8916100448540 |
| 13 | 302875106592254 |
| 14 | 11112006826381564 |
| 15 | 437893890380862528 |
| 16 | 18446744073709551617 |
| 17 | 827240261886336764178 |
| 18 | 39346408075296924995918 |
| 19 | 1978419655660313589123980 |
| 20 | 104857600000000000000003382 |
[1,5,28,257,3126,46688,823544,16777217,387420490, 10000003130,285311670612,8916100448540, 302875106592254,11112006826381564, 437893890380862528,18446744073709551617, 827240261886336764178,39346408075296924995918, 1978419655660313589123980, 104857600000000000000003382] |