The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 9 |
| 3 | 42 |
| 4 | 130 |
| 5 | 315 |
| 6 | 651 |
| 7 | 1204 |
| 8 | 2052 |
| 9 | 3285 |
| 10 | 5005 |
| 11 | 7326 |
| 12 | 10374 |
| 13 | 14287 |
| 14 | 19215 |
| 15 | 25320 |
| 16 | 32776 |
| 17 | 41769 |
| 18 | 52497 |
| 19 | 65170 |
| 20 | 80010 |
| 21 | 97251 |
| 22 | 117139 |
| 23 | 139932 |
| 24 | 165900 |
| 25 | 195325 |
| 26 | 228501 |
| 27 | 265734 |
| 28 | 307342 |
| 29 | 353655 |
| 30 | 405015 |
| 31 | 461776 |
| 32 | 524304 |
| 33 | 592977 |
| 34 | 668185 |
| 35 | 750330 |
| 36 | 839826 |
| 37 | 937099 |
[0,1,9,42,130,315,651,1204,2052,3285,5005,7326, 10374,14287,19215,25320,32776,41769,52497,65170, 80010,97251,117139,139932,165900,195325,228501, 265734,307342,353655,405015,461776,524304,592977, 668185,750330,839826,937099] |