n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 18 |
3 | 114 |
4 | 900 |
5 | 8845 |
6 | 103861 |
7 | 1427122 |
8 | 22486706 |
9 | 399906140 |
10 | 7922936720 |
11 | 173013117604 |
12 | 4127746294408 |
13 | 106806183646594 |
14 | 2978731438384738 |
15 | 89065499057526433 |
16 | 2842061902985159593 |
17 | 96395720127638538076 |
18 | 3462922846509648162418 |
[1,4,18,114,900,8845,103861,1427122,22486706, 399906140,7922936720,173013117604,4127746294408, 106806183646594,2978731438384738, 89065499057526433,2842061902985159593, 96395720127638538076,3462922846509648162418] |