The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 2 |
| 3 | 6 |
| 4 | 40 |
| 5 | 55 |
| 6 | 145 |
| 7 | 238 |
| 8 | 584 |
| 9 | 612 |
| 10 | 1350 |
| 11 | 1804 |
| 12 | 2401 |
| 13 | 3523 |
| 14 | 5180 |
| 15 | 6150 |
| 16 | 9312 |
| 17 | 11101 |
| 18 | 13645 |
| 19 | 17746 |
| 20 | 22300 |
| 21 | 25998 |
| 22 | 33462 |
| 23 | 39514 |
| 24 | 43993 |
| 25 | 55225 |
| 26 | 66976 |
| 27 | 74088 |
| 28 | 88956 |
| 29 | 102109 |
| 30 | 111841 |
| 31 | 133672 |
| 32 | 155808 |
| 33 | 170940 |
| 34 | 198798 |
| 35 | 220150 |
| 36 | 243937 |
| 37 | 275983 |
| 38 | 313728 |
| 39 | 338208 |
| 40 | 382480 |
| 41 | 419143 |
| 42 | 448561 |
| 43 | 507658 |
[0,2,6,40,55,145,238,584,612,1350,1804,2401,3523, 5180,6150,9312,11101,13645,17746,22300,25998, 33462,39514,43993,55225,66976,74088,88956,102109, 111841,133672,155808,170940,198798,220150,243937, 275983,313728,338208,382480,419143,448561,507658] |