The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 11 |
| 4 | 56 |
| 5 | 127 |
| 6 | 1100 |
| 7 | 1717 |
| 8 | 19300 |
| 9 | 64406 |
| 10 | 383010 |
| 11 | 352717 |
| 12 | 23214660 |
| 13 | 5200301 |
| 14 | 191172406 |
| 15 | 3465549077 |
| 16 | 20859527460 |
| 17 | 1166803111 |
| 18 | 1010698826825 |
| 19 | 17672631901 |
| 20 | 102589250081802 |
| 21 | 286539905316908 |
| 22 | 75260204476154 |
| 23 | 4116715363801 |
| 24 | 548610025890719156 |
[1,4,11,56,127,1100,1717,19300,64406,383010, 352717,23214660,5200301,191172406,3465549077, 20859527460,1166803111,1010698826825,17672631901, 102589250081802,286539905316908,75260204476154, 4116715363801,548610025890719156] |