The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | -1 |
| 1 | 45 |
| 2 | 231 |
| 3 | 770 |
| 4 | 2277 |
| 5 | 5796 |
| 6 | 13915 |
| 7 | 30843 |
| 8 | 65550 |
| 9 | 132825 |
| 10 | 260568 |
| 11 | 494385 |
| 12 | 915124 |
| 13 | 1651815 |
| 14 | 2922381 |
| 15 | 5069867 |
| 16 | 8650530 |
| 17 | 14525742 |
| 18 | 24053215 |
| 19 | 39299778 |
| 20 | 63447087 |
| 21 | 101268540 |
| 22 | 159963804 |
| 23 | 250188435 |
| 24 | 387746282 |
| 25 | 595726956 |
| 26 | 907877355 |
| 27 | 1372935090 |
| 28 | 2061208710 |
| 29 | 3073155810 |
| 30 | 4552039296 |
| 31 | 6700526910 |
[-1,45,231,770,2277,5796,13915,30843,65550,132825, 260568,494385,915124,1651815,2922381,5069867, 8650530,14525742,24053215,39299778,63447087, 101268540,159963804,250188435,387746282,595726956, 907877355,1372935090,2061208710,3073155810, 4552039296,6700526910] |