n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 3 |
3 | 10 |
4 | 41 |
5 | 206 |
6 | 1237 |
7 | 8660 |
8 | 69281 |
9 | 623530 |
10 | 6235301 |
11 | 68588312 |
12 | 823059745 |
13 | 10699776686 |
14 | 149796873605 |
15 | 2246953104076 |
16 | 35951249665217 |
17 | 611171244308690 |
18 | 11001082397556421 |
19 | 209020565553572000 |
20 | 4180411311071440001 |
21 | 87788637532500240022 |
[0,1,3,10,41,206,1237,8660,69281,623530,6235301, 68588312,823059745,10699776686,149796873605, 2246953104076,35951249665217,611171244308690, 11001082397556421,209020565553572000, 4180411311071440001,87788637532500240022] |