The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 6 |
| 4 | 38 |
| 5 | 107 |
| 6 | 350 |
| 7 | 728 |
| 8 | 1752 |
| 9 | 3090 |
| 10 | 6215 |
| 11 | 9878 |
| 12 | 17654 |
| 13 | 26117 |
| 14 | 42924 |
| 15 | 60256 |
| 16 | 93024 |
| 17 | 125460 |
| 18 | 184509 |
| 19 | 241110 |
| 20 | 341110 |
| 21 | 434511 |
| 22 | 595562 |
| 23 | 742808 |
| 24 | 991640 |
| 25 | 1215110 |
| 26 | 1586403 |
| 27 | 1914822 |
| 28 | 2452646 |
| 29 | 2922185 |
| 30 | 3681560 |
| 31 | 4337024 |
| 32 | 5385600 |
| 33 | 6281704 |
| 34 | 7701561 |
| 35 | 8904294 |
| 36 | 10793862 |
| 37 | 12381939 |
| 38 | 14858038 |
| 39 | 16924440 |
| 40 | 20124440 |
| 41 | 22778042 |
| 42 | 26862143 |
| 43 | 30229430 |
| 44 | 35383062 |
| 45 | 39609933 |
| 46 | 46046276 |
| 47 | 51299936 |
| 48 | 59262560 |
| 49 | 65733500 |
| 50 | 75499125 |
[0,1,6,38,107,350,728,1752,3090,6215,9878,17654, 26117,42924,60256,93024,125460,184509,241110, 341110,434511,595562,742808,991640,1215110, 1586403,1914822,2452646,2922185,3681560,4337024, 5385600,6281704,7701561,8904294,10793862,12381939, 14858038,16924440,20124440,22778042,26862143, 30229430,35383062,39609933,46046276,51299936, 59262560,65733500,75499125] |