The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 3 |
| 3 | 10 |
| 4 | 41 |
| 5 | 158 |
| 6 | 702 |
| 7 | 2951 |
| 8 | 13531 |
| 9 | 59679 |
| 10 | 279266 |
| 11 | 1267940 |
| 12 | 6011119 |
| 13 | 27824861 |
| 14 | 133106182 |
| 15 | 624539770 |
| 16 | 3007192301 |
| 17 | 14250852118 |
| 18 | 68956019667 |
| 19 | 329253123658 |
| 20 | 1599237074380 |
| 21 | 7681161476024 |
| 22 | 37421712300453 |
| 23 | 180582683291940 |
| 24 | 881943174983702 |
| 25 | 4272175007442205 |
| 26 | 20907265586602568 |
| 27 | 101595040578062943 |
[1,1,3,10,41,158,702,2951,13531,59679,279266, 1267940,6011119,27824861,133106182,624539770, 3007192301,14250852118,68956019667,329253123658, 1599237074380,7681161476024,37421712300453, 180582683291940,881943174983702,4272175007442205, 20907265586602568,101595040578062943] |