The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 105 |
| 3 | 430 |
| 4 | 4305 |
| 5 | 5600 |
| 6 | 16840 |
| 7 | 27195 |
| 8 | 33860 |
| 9 | 42925 |
| 10 | 218960 |
| 11 | 895275 |
| 12 | 1221860 |
| 13 | 1275170 |
| 14 | 1548445 |
| 15 | 1657225 |
| 16 | 6018495 |
| 17 | 7892360 |
| 18 | 44002820 |
| 19 | 45962330 |
| 20 | 47681900 |
| 21 | 55760125 |
| 22 | 56319925 |
| 23 | 59679145 |
| 24 | 60331825 |
| 25 | 277695950 |
| 26 | 284180120 |
| 27 | 348285175 |
[0,105,430,4305,5600,16840,27195,33860,42925, 218960,895275,1221860,1275170,1548445,1657225, 6018495,7892360,44002820,45962330,47681900, 55760125,56319925,59679145,60331825,277695950, 284180120,348285175] |