The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 450 |
| 2 | 2723 |
| 3 | 16625 |
| 4 | 75959 |
| 5 | 305707 |
| 6 | 1087364 |
| 7 | 3598487 |
| 8 | 11219006 |
| 9 | 33417573 |
| 10 | 95950526 |
| 11 | 267699183 |
| 12 | 729912815 |
| 13 | 1953438640 |
| 14 | 5149262462 |
| 15 | 13406957125 |
| 16 | 34558018931 |
| 17 | 88348005194 |
| 18 | 224349137386 |
| 19 | 566585100420 |
| 20 | 1424483824200 |
| 21 | 3568296361053 |
[450,2723,16625,75959,305707,1087364,3598487, 11219006,33417573,95950526,267699183,729912815, 1953438640,5149262462,13406957125,34558018931, 88348005194,224349137386,566585100420, 1424483824200,3568296361053] |