The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 1 |
| 5 | 3 |
| 6 | 11 |
| 7 | 50 |
| 8 | 1 |
| 9 | 2 |
| 10 | 9 |
| 11 | 33 |
| 12 | 129 |
| 13 | 550 |
| 14 | 2526 |
| 15 | 12445 |
| 16 | 1 |
| 17 | 2 |
| 18 | 8 |
| 19 | 26 |
| 20 | 86 |
| 21 | 302 |
| 22 | 1103 |
| 23 | 4216 |
| 24 | 16834 |
| 25 | 70064 |
| 26 | 303520 |
| 27 | 1366413 |
| 28 | 6383595 |
| 29 | 30907397 |
| 30 | 154895272 |
| 31 | 802588710 |
| 32 | 1 |
| 33 | 2 |
| 34 | 7 |
| 35 | 23 |
| 36 | 69 |
| 37 | 215 |
| 38 | 685 |
| 39 | 2242 |
| 40 | 7523 |
| 41 | 25881 |
| 42 | 91237 |
| 43 | 329377 |
| 44 | 1217078 |
| 45 | 4600595 |
| 46 | 17781207 |
| 47 | 70234475 |
[1,1,3,1,3,11,50,1,2,9,33,129,550,2526,12445,1,2, 8,26,86,302,1103,4216,16834,70064,303520,1366413, 6383595,30907397,154895272,802588710,1,2,7,23,69, 215,685,2242,7523,25881,91237,329377,1217078, 4600595,17781207,70234475] |