n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 18 |
4 | 88 |
5 | 455 |
6 | 2444 |
7 | 13486 |
8 | 75912 |
9 | 433935 |
10 | 2511388 |
11 | 14684422 |
12 | 86611848 |
13 | 514704064 |
14 | 3078845696 |
15 | 18523994024 |
16 | 112026315616 |
17 | 680626958899 |
18 | 4152411174284 |
19 | 25428402204982 |
20 | 156247439709832 |
21 | 963048223399984 |
22 | 5952595420121536 |
23 | 36887847899094888 |
24 | 229132114803540320 |
25 | 1426367728966653535 |
26 | 8897049258366111004 |
[1,4,18,88,455,2444,13486,75912,433935,2511388, 14684422,86611848,514704064,3078845696, 18523994024,112026315616,680626958899, 4152411174284,25428402204982,156247439709832, 963048223399984,5952595420121536, 36887847899094888,229132114803540320, 1426367728966653535,8897049258366111004] |