The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 12 |
| 4 | 56 |
| 5 | 180 |
| 6 | 304 |
| 7 | 336 |
| 8 | 936 |
| 9 | 1696 |
| 10 | 1824 |
| 11 | 2484 |
| 12 | 5040 |
| 13 | 5328 |
| 14 | 6664 |
| 15 | 8384 |
| 16 | 8512 |
| 17 | 9900 |
| 18 | 10176 |
| 19 | 13176 |
| 20 | 14040 |
| 21 | 25632 |
| 22 | 26208 |
| 23 | 27360 |
| 24 | 33372 |
| 25 | 33712 |
| 26 | 37260 |
| 27 | 39808 |
| 28 | 39984 |
| 29 | 47488 |
| 30 | 50304 |
| 31 | 51072 |
| 32 | 52200 |
| 33 | 65232 |
| 34 | 69552 |
| 35 | 79920 |
| 36 | 126900 |
| 37 | 128448 |
| 38 | 142272 |
| 39 | 149184 |
| 40 | 152640 |
| 41 | 162648 |
| 42 | 167776 |
| 43 | 184064 |
| 44 | 193752 |
| 45 | 197640 |
[1,2,12,56,180,304,336,936,1696,1824,2484,5040, 5328,6664,8384,8512,9900,10176,13176,14040,25632, 26208,27360,33372,33712,37260,39808,39984,47488, 50304,51072,52200,65232,69552,79920,126900,128448, 142272,149184,152640,162648,167776,184064,193752, 197640] |