The OEIS is supported by the many generous donors to the OEIS Foundation.
A186231 as a simple table
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 210 |
| 3 | 3003 |
| 4 | 43758 |
| 5 | 646646 |
| 6 | 9657700 |
| 7 | 145422675 |
| 8 | 2203961430 |
| 9 | 33578000610 |
| 10 | 513791607420 |
| 11 | 7890371113950 |
| 12 | 121548660036300 |
| 13 | 1877405874732108 |
| 14 | 29065024282889672 |
| 15 | 450883717216034179 |
| 16 | 7007092303604022630 |
| 17 | 109069992321755544170 |
| 18 | 1700179760011004467468 |
| 19 | 26536589497469056215210 |
| 20 | 414670662257153823494820 |
[1,15,210,3003,43758,646646,9657700,145422675, 2203961430,33578000610,513791607420,7890371113950, 121548660036300,1877405874732108, 29065024282889672,450883717216034179, 7007092303604022630,109069992321755544170, 1700179760011004467468,26536589497469056215210, 414670662257153823494820] |