n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 13 |
5 | 41 |
6 | 166 |
7 | 652 |
8 | 3494 |
9 | 18118 |
10 | 114076 |
11 | 681176 |
12 | 5016892 |
13 | 35377564 |
14 | 288204008 |
15 | 2232198256 |
16 | 21124254181 |
17 | 191779964597 |
18 | 2011347229114 |
19 | 19840403629108 |
20 | 231266808172181 |
21 | 2553719667653281 |
22 | 31743603728993542 |
[1,1,2,4,13,41,166,652,3494,18118,114076,681176, 5016892,35377564,288204008,2232198256,21124254181, 191779964597,2011347229114,19840403629108, 231266808172181,2553719667653281, 31743603728993542] |