The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 14 |
| 3 | 64 |
| 4 | 312 |
| 5 | 1509 |
| 6 | 7453 |
| 7 | 36705 |
| 8 | 182306 |
| 9 | 904450 |
| 10 | 4504678 |
| 11 | 22425745 |
| 12 | 111860659 |
| 13 | 557873292 |
| 14 | 2785109263 |
| 15 | 13903649793 |
| 16 | 69448593079 |
| 17 | 346895872507 |
| 18 | 1733313215705 |
| 19 | 8660909647098 |
| 20 | 43284667243118 |
| 21 | 216329048923139 |
| 22 | 1081301272953975 |
| 23 | 5404905018332207 |
| 24 | 27018500855114772 |
| 25 | 135064878802668940 |
[1,3,14,64,312,1509,7453,36705,182306,904450, 4504678,22425745,111860659,557873292,2785109263, 13903649793,69448593079,346895872507, 1733313215705,8660909647098,43284667243118, 216329048923139,1081301272953975,5404905018332207, 27018500855114772,135064878802668940] |