The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 10 |
| 2 | 54 |
| 3 | 209 |
| 4 | 649 |
| 5 | 1717 |
| 6 | 4015 |
| 7 | 8504 |
| 8 | 16599 |
| 9 | 30239 |
| 10 | 51909 |
| 11 | 84591 |
| 12 | 131625 |
| 13 | 196470 |
| 14 | 282369 |
| 15 | 391939 |
| 16 | 526724 |
| 17 | 686763 |
| 18 | 870233 |
| 19 | 1073227 |
| 20 | 1289718 |
| 21 | 1511742 |
| 22 | 1729808 |
| 23 | 1933514 |
| 24 | 2112319 |
| 25 | 2256396 |
| 26 | 2357475 |
| 27 | 2409581 |
| 28 | 2409581 |
| 29 | 2357475 |
| 30 | 2256396 |
[1,10,54,209,649,1717,4015,8504,16599,30239,51909, 84591,131625,196470,282369,391939,526724,686763, 870233,1073227,1289718,1511742,1729808,1933514, 2112319,2256396,2357475,2409581,2409581,2357475, 2256396] |