The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 48 |
| 2 | 230 |
| 3 | 690 |
| 4 | 1896 |
| 5 | 4914 |
| 6 | 12834 |
| 7 | 33110 |
| 8 | 87532 |
| 9 | 231044 |
| 10 | 626294 |
| 11 | 1696208 |
| 12 | 4710442 |
| 13 | 13035934 |
| 14 | 36914622 |
| 15 | 103843336 |
| 16 | 298400536 |
| 17 | 849446000 |
| 18 | 2467182708 |
| 19 | 7083241528 |
| 20 | 20732756786 |
| 21 | 59887058198 |
| 22 | 176273740060 |
| 23 | 511404834472 |
| 24 | 1511408416446 |
[48,230,690,1896,4914,12834,33110,87532,231044, 626294,1696208,4710442,13035934,36914622, 103843336,298400536,849446000,2467182708, 7083241528,20732756786,59887058198,176273740060, 511404834472,1511408416446] |