n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 4 |
5 | 9 |
6 | 21 |
7 | 56 |
8 | 155 |
9 | 469 |
10 | 1480 |
11 | 4882 |
12 | 16545 |
13 | 57384 |
14 | 202060 |
15 | 720526 |
16 | 2593494 |
17 | 9408469 |
18 | 34350507 |
19 | 126109784 |
20 | 465200333 |
21 | 1723346074 |
22 | 6408356210 |
23 | 23911272090 |
24 | 89495909409 |
25 | 335916761128 |
26 | 1264114452996 |
27 | 4768464309416 |
28 | 18027250459483 |
29 | 68291947831046 |
30 | 259200707489634 |
[1,1,2,4,9,21,56,155,469,1480,4882,16545,57384, 202060,720526,2593494,9408469,34350507,126109784, 465200333,1723346074,6408356210,23911272090, 89495909409,335916761128,1264114452996, 4768464309416,18027250459483,68291947831046, 259200707489634] |