n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 26 |
4 | 251 |
5 | 3157 |
6 | 50310 |
7 | 978315 |
8 | 22616102 |
9 | 610543614 |
10 | 18953178234 |
11 | 668200802513 |
12 | 26484030901784 |
13 | 1169889631517219 |
14 | 57168091338306720 |
15 | 3070545537985858612 |
16 | 180251920018830890897 |
17 | 11507450028966272232867 |
18 | 795397552661209049095698 |
[1,1,4,26,251,3157,50310,978315,22616102, 610543614,18953178234,668200802513,26484030901784, 1169889631517219,57168091338306720, 3070545537985858612,180251920018830890897, 11507450028966272232867,795397552661209049095698] |