n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 26 |
4 | 258 |
5 | 3346 |
6 | 54108 |
7 | 1054256 |
8 | 24161966 |
9 | 634230122 |
10 | 18806776982 |
11 | 622011916184 |
12 | 22754818956246 |
13 | 912075762692584 |
14 | 39755634279964662 |
15 | 1872279469323840472 |
16 | 94783193260373606758 |
17 | 5135585509536795416348 |
18 | 296656123838796109849526 |
19 | 18200829821539972354967252 |
[1,1,4,26,258,3346,54108,1054256,24161966, 634230122,18806776982,622011916184,22754818956246, 912075762692584,39755634279964662, 1872279469323840472,94783193260373606758, 5135585509536795416348,296656123838796109849526, 18200829821539972354967252] |