The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 0 |
| 5 | 1 |
| 6 | 0 |
| 7 | 0 |
| 8 | 1 |
| 9 | 48 |
| 10 | 0 |
| 11 | 0 |
| 12 | 1 |
| 13 | 72 |
| 14 | 3654 |
| 15 | 0 |
| 16 | 0 |
| 17 | 1 |
| 18 | 72 |
| 19 | 9168 |
| 20 | 546604 |
| 21 | 0 |
| 22 | 0 |
| 23 | 1 |
| 24 | 72 |
| 25 | 10716 |
| 26 | 2507552 |
| 27 | 173123868 |
| 28 | 0 |
| 29 | 0 |
| 30 | 1 |
| 31 | 72 |
| 32 | 10794 |
| 33 | 4023409 |
| 34 | 1585190304 |
| 35 | 120268341210 |
| 36 | 0 |
| 37 | 0 |
| 38 | 1 |
| 39 | 72 |
| 40 | 10794 |
| 41 | 4396148 |
| 42 | 3973372776 |
| 43 | 2396160624384 |
| 44 | 186894023900240 |
| 45 | 0 |
| 46 | 0 |
| 47 | 1 |
| 48 | 72 |
[0,0,0,0,1,0,0,1,48,0,0,1,72,3654,0,0,1,72,9168, 546604,0,0,1,72,10716,2507552,173123868,0,0,1,72, 10794,4023409,1585190304,120268341210,0,0,1,72, 10794,4396148,3973372776,2396160624384, 186894023900240,0,0,1,72] |