n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 28 |
6 | 88 |
7 | 306 |
8 | 1158 |
9 | 4730 |
10 | 20722 |
11 | 96776 |
12 | 479340 |
13 | 2507510 |
14 | 13804014 |
15 | 79718782 |
16 | 481614806 |
17 | 3036358968 |
18 | 19932689952 |
19 | 135981543762 |
20 | 962319171782 |
21 | 7053068549250 |
22 | 53458038451082 |
23 | 418440466421960 |
24 | 3378290373259300 |
25 | 28099682071640734 |
26 | 240537280709926718 |
[1,1,2,4,10,28,88,306,1158,4730,20722,96776, 479340,2507510,13804014,79718782,481614806, 3036358968,19932689952,135981543762,962319171782, 7053068549250,53458038451082,418440466421960, 3378290373259300,28099682071640734, 240537280709926718] |