n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 19 |
4 | 72 |
5 | 355 |
6 | 1347 |
7 | 6843 |
8 | 26077 |
9 | 135752 |
10 | 519336 |
11 | 2760110 |
12 | 10591394 |
13 | 57299551 |
14 | 220393887 |
15 | 1210772453 |
16 | 4665698732 |
17 | 25974365600 |
18 | 100243916036 |
19 | 564517479641 |
20 | 2181476412875 |
21 | 12407767954139 |
22 | 48002072364351 |
23 | 275392803316254 |
24 | 1066512702720864 |
25 | 6164746100658825 |
26 | 23896975393255717 |
[1,4,19,72,355,1347,6843,26077,135752,519336, 2760110,10591394,57299551,220393887,1210772453, 4665698732,25974365600,100243916036,564517479641, 2181476412875,12407767954139,48002072364351, 275392803316254,1066512702720864,6164746100658825, 23896975393255717] |