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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 15 |
| 5 | 52 |
| 6 | 203 |
| 7 | 877 |
| 8 | 4140 |
| 9 | 21147 |
| 10 | 115975 |
| 11 | 562595 |
| 12 | 2504665 |
| 13 | 10579224 |
| 14 | 43453459 |
| 15 | 176472854 |
| 16 | 716369167 |
| 17 | 2927448727 |
| 18 | 12099445274 |
| 19 | 50734619570 |
| 20 | 216264854789 |
| 21 | 928045216933 |
| 22 | 3986352066095 |
| 23 | 17086933963355 |
| 24 | 72987960721209 |
| 25 | 310631150855373 |
| 26 | 1317808552742134 |
[1,1,2,5,15,52,203,877,4140,21147,115975,562595, 2504665,10579224,43453459,176472854,716369167, 2927448727,12099445274,50734619570,216264854789, 928045216933,3986352066095,17086933963355, 72987960721209,310631150855373,1317808552742134] |