n | a(n) |
---|---|
0 | 2 |
1 | 18 |
2 | 108 |
3 | 540 |
4 | 2430 |
5 | 10206 |
6 | 40824 |
7 | 157464 |
8 | 590490 |
9 | 2165130 |
10 | 7794468 |
11 | 27634932 |
12 | 96722262 |
13 | 334807830 |
14 | 1147912560 |
15 | 3902902704 |
16 | 13172296626 |
17 | 44165935746 |
18 | 147219785820 |
19 | 488149816140 |
20 | 1610894393262 |
21 | 5292938720718 |
22 | 17322344904168 |
23 | 56485907296200 |
24 | 183579198712650 |
25 | 594796603828986 |
[2,18,108,540,2430,10206,40824,157464,590490, 2165130,7794468,27634932,96722262,334807830, 1147912560,3902902704,13172296626,44165935746, 147219785820,488149816140,1610894393262, 5292938720718,17322344904168,56485907296200, 183579198712650,594796603828986] |