The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 16 |
| 2 | 256 |
| 3 | 1968 |
| 4 | 15129 |
| 5 | 139605 |
| 6 | 1288225 |
| 7 | 11204720 |
| 8 | 97456384 |
| 9 | 865369648 |
| 10 | 7684100281 |
| 11 | 67718944293 |
| 12 | 596797965729 |
| 13 | 5274143802564 |
| 14 | 46609731345424 |
| 15 | 411483568613260 |
| 16 | 3632690477958025 |
| 17 | 32082757563158885 |
| 18 | 283344628203780049 |
[16,256,1968,15129,139605,1288225,11204720, 97456384,865369648,7684100281,67718944293, 596797965729,5274143802564,46609731345424, 411483568613260,3632690477958025, 32082757563158885,283344628203780049] |