n | a(n) |
---|---|
1 | 4 |
2 | 31 |
3 | 227 |
4 | 1674 |
5 | 12367 |
6 | 91380 |
7 | 675214 |
8 | 4989191 |
9 | 36865412 |
10 | 272400600 |
11 | 2012783315 |
12 | 14872568831 |
13 | 109894245429 |
14 | 812014744422 |
15 | 6000022499693 |
16 | 44334502845080 |
17 | 327590128640500 |
18 | 2420581837980561 |
19 | 17885814992891026 |
[4,31,227,1674,12367,91380,675214,4989191, 36865412,272400600,2012783315,14872568831, 109894245429,812014744422,6000022499693, 44334502845080,327590128640500,2420581837980561, 17885814992891026] |