n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 78 |
6 | 453 |
7 | 3057 |
8 | 23698 |
9 | 207358 |
10 | 2021746 |
11 | 21733773 |
12 | 255371835 |
13 | 3255990905 |
14 | 44769874946 |
15 | 660355655453 |
16 | 10400601573396 |
17 | 174210076354396 |
18 | 3092228855290534 |
19 | 57979291036697518 |
20 | 1145090997974775999 |
[1,0,1,4,16,78,453,3057,23698,207358,2021746, 21733773,255371835,3255990905,44769874946, 660355655453,10400601573396,174210076354396, 3092228855290534,57979291036697518, 1145090997974775999] |