n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 26 |
5 | 153 |
6 | 1230 |
7 | 13364 |
8 | 196940 |
9 | 3964902 |
10 | 110220876 |
11 | 4272079445 |
12 | 232593337728 |
13 | 17882578732969 |
14 | 1948605911230499 |
15 | 301712214427188701 |
16 | 66502429409739480660 |
17 | 20895237675211683912974 |
18 | 9368442364990639729658716 |
19 | 5998494566458610304486161295 |
[1,1,2,6,26,153,1230,13364,196940,3964902, 110220876,4272079445,232593337728,17882578732969, 1948605911230499,301712214427188701, 66502429409739480660,20895237675211683912974, 9368442364990639729658716, 5998494566458610304486161295] |