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A294054 as a simple table
| n | a(n) |
|---|---|
| 6 | 15 |
| 7 | 129 |
| 8 | 836 |
| 9 | 4789 |
| 10 | 25430 |
| 11 | 128360 |
| 12 | 625905 |
| 13 | 2976800 |
| 14 | 13896153 |
| 15 | 63950894 |
| 16 | 291050996 |
| 17 | 1312981604 |
| 18 | 5881158250 |
| 19 | 26191105884 |
| 20 | 116085151862 |
| 21 | 512487018089 |
| 22 | 2255036961813 |
| 23 | 9895020092839 |
| 24 | 43316960894877 |
| 25 | 189247864529166 |
| 26 | 825397574526671 |
| 27 | 3594688070523059 |
| 28 | 15635607417594050 |
[15,129,836,4789,25430,128360,625905,2976800, 13896153,63950894,291050996,1312981604,5881158250, 26191105884,116085151862,512487018089, 2255036961813,9895020092839,43316960894877, 189247864529166,825397574526671,3594688070523059, 15635607417594050] |