n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 2 |
3 | 5 |
4 | 15 |
5 | 47 |
6 | 156 |
7 | 527 |
8 | 1826 |
9 | 6407 |
10 | 22762 |
11 | 81587 |
12 | 294711 |
13 | 1070973 |
14 | 3912808 |
15 | 14358493 |
16 | 52893647 |
17 | 195498831 |
18 | 724704974 |
19 | 2693397035 |
20 | 10033263089 |
21 | 37452388361 |
22 | 140063288728 |
[0,1,2,5,15,47,156,527,1826,6407,22762,81587, 294711,1070973,3912808,14358493,52893647, 195498831,724704974,2693397035,10033263089, 37452388361,140063288728] |