The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 19 |
| 1 | 58 |
| 2 | 309 |
| 3 | 1603 |
| 4 | 5118 |
| 5 | 196087 |
| 6 | 593379 |
| 7 | 3162982 |
| 8 | 16408289 |
| 9 | 52387849 |
| 10 | 2007146551 |
| 11 | 6073827502 |
| 12 | 32376284061 |
| 13 | 167955247807 |
| 14 | 536242027482 |
| 15 | 20545152292123 |
| 16 | 62171698903851 |
| 17 | 331403646811378 |
| 18 | 1719189932960741 |
| 19 | 5488973445693601 |
| 20 | 210300180869317579 |
| 21 | 636389516053646338 |
[19,58,309,1603,5118,196087,593379,3162982, 16408289,52387849,2007146551,6073827502, 32376284061,167955247807,536242027482, 20545152292123,62171698903851,331403646811378, 1719189932960741,5488973445693601, 210300180869317579,636389516053646338] |