n | a(n) |
---|---|
1 | 1 |
2 | 3 |
3 | 12 |
4 | 70 |
5 | 560 |
6 | 5810 |
7 | 74760 |
8 | 1153740 |
9 | 20817588 |
10 | 430604724 |
11 | 10052947476 |
12 | 261595087182 |
13 | 7509722346204 |
14 | 235808741944100 |
15 | 8040824716606176 |
16 | 295914258931377276 |
17 | 11690732617035570008 |
18 | 493527339623630078552 |
[1,3,12,70,560,5810,74760,1153740,20817588, 430604724,10052947476,261595087182,7509722346204, 235808741944100,8040824716606176, 295914258931377276,11690732617035570008, 493527339623630078552] |