The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 8 |
| 4 | 18 |
| 5 | 38 |
| 6 | 87 |
| 7 | 114 |
| 8 | 155 |
| 9 | 282 |
| 10 | 751 |
| 11 | 949 |
| 12 | 1257 |
| 13 | 1553 |
| 14 | 1858 |
| 15 | 2178 |
| 16 | 4800 |
| 17 | 5384 |
| 18 | 18796 |
| 19 | 37562 |
| 20 | 64420 |
| 21 | 252719 |
| 22 | 933709 |
| 23 | 289738117 |
| 24 | 332250401 |
| 25 | 667752899 |
| 26 | 699497052 |
| 27 | 966290117 |
| 28 | 224582902442 |
| 29 | 319654121875 |
| 30 | 418843012121 |
| 31 | 802386465583 |
[1,4,8,18,38,87,114,155,282,751,949,1257,1553, 1858,2178,4800,5384,18796,37562,64420,252719, 933709,289738117,332250401,667752899,699497052, 966290117,224582902442,319654121875,418843012121, 802386465583] |