The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 5 | 4 |
| 6 | 5 |
| 7 | 35 |
| 8 | 0 |
| 9 | 280 |
| 10 | 1991 |
| 11 | 4115 |
| 12 | 34840 |
| 13 | 96286 |
| 14 | 309036 |
| 15 | 1045200 |
| 16 | 193240 |
| 17 | 5159120 |
| 18 | 40653929 |
| 19 | 105545340 |
| 20 | 603157520 |
| 21 | 2582073261 |
| 22 | 11015773404 |
| 23 | 26828044860 |
| 24 | 182118031760 |
| 25 | 726122370210 |
| 26 | 3026319516720 |
| 27 | 9620891607824 |
| 28 | 49247195403600 |
| 29 | 161316665871200 |
| 30 | 638742288482240 |
[4,5,35,0,280,1991,4115,34840,96286,309036, 1045200,193240,5159120,40653929,105545340, 603157520,2582073261,11015773404,26828044860, 182118031760,726122370210,3026319516720, 9620891607824,49247195403600,161316665871200, 638742288482240] |