n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 6 |
4 | 57 |
5 | 683 |
6 | 9474 |
7 | 145815 |
8 | 2430393 |
9 | 43202448 |
10 | 810629805 |
11 | 15938815794 |
12 | 326653743510 |
13 | 6949638584208 |
14 | 153009877730525 |
15 | 3477623225388063 |
16 | 81429702521625843 |
17 | 1961136442605508341 |
18 | 48513571089988199157 |
[1,1,6,57,683,9474,145815,2430393,43202448, 810629805,15938815794,326653743510,6949638584208, 153009877730525,3477623225388063, 81429702521625843,1961136442605508341, 48513571089988199157] |