n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 7 |
4 | 18 |
5 | 78 |
6 | 220 |
7 | 1043 |
8 | 3090 |
9 | 15402 |
10 | 47044 |
11 | 242126 |
12 | 755076 |
13 | 3973820 |
14 | 12580344 |
15 | 67303139 |
16 | 215511330 |
17 | 1167556434 |
18 | 3772175860 |
19 | 20640707866 |
20 | 67167649868 |
21 | 370510806212 |
22 | 1212836703304 |
23 | 6735128062542 |
24 | 22156120392276 |
25 | 123731147310820 |
26 | 408741630687656 |
27 | 2293595176625340 |
[1,1,2,7,18,78,220,1043,3090,15402,47044,242126, 755076,3973820,12580344,67303139,215511330, 1167556434,3772175860,20640707866,67167649868, 370510806212,1212836703304,6735128062542, 22156120392276,123731147310820,408741630687656, 2293595176625340] |