n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 21 |
5 | 76 |
6 | 270 |
7 | 927 |
8 | 3074 |
9 | 9886 |
10 | 30985 |
11 | 95064 |
12 | 286558 |
13 | 851203 |
14 | 2497550 |
15 | 7252494 |
16 | 20874861 |
17 | 59630404 |
18 | 169225518 |
19 | 477513639 |
20 | 1340705306 |
21 | 3747697726 |
22 | 10435070737 |
23 | 28954040496 |
24 | 80087091646 |
25 | 220897122571 |
26 | 607726482470 |
27 | 1668084221742 |
28 | 4568859998709 |
29 | 12489795988636 |
[1,1,2,6,21,76,270,927,3074,9886,30985,95064, 286558,851203,2497550,7252494,20874861,59630404, 169225518,477513639,1340705306,3747697726, 10435070737,28954040496,80087091646,220897122571, 607726482470,1668084221742,4568859998709, 12489795988636] |