n | a(n) |
---|---|
1 | 2 |
2 | 72 |
3 | 1442 |
4 | 20260 |
5 | 220250 |
6 | 1958460 |
7 | 14768810 |
8 | 96900810 |
9 | 563873400 |
10 | 2953859370 |
11 | 14097919968 |
12 | 61908797418 |
13 | 252208679268 |
14 | 959882556570 |
15 | 3433533723900 |
16 | 11603837100660 |
17 | 37221177046410 |
18 | 113779617228060 |
19 | 332648955112250 |
20 | 933146517188760 |
21 | 2518877938240202 |
[2,72,1442,20260,220250,1958460,14768810,96900810, 563873400,2953859370,14097919968,61908797418, 252208679268,959882556570,3433533723900, 11603837100660,37221177046410,113779617228060, 332648955112250,933146517188760,2518877938240202] |