n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 6 |
4 | 21 |
5 | 80 |
6 | 4151 |
7 | 6982 |
8 | 269563 |
9 | 779693 |
10 | 834365 |
11 | 16176645 |
12 | 19770092 |
13 | 41049539 |
14 | 228612936 |
15 | 1950787140 |
16 | 2404785364 |
17 | 3095996836 |
18 | 5236785750 |
[1,4,6,21,80,4151,6982,269563,779693,834365, 16176645,19770092,41049539,228612936,1950787140, 2404785364,3095996836,5236785750] |