n | a(n) |
---|---|
1 | 1 |
2 | 5 |
3 | 26 |
4 | 130 |
5 | 651 |
6 | 3255 |
7 | 16276 |
8 | 81380 |
9 | 406901 |
10 | 2034505 |
11 | 10172526 |
12 | 50862630 |
13 | 254313151 |
14 | 1271565755 |
15 | 6357828776 |
16 | 31789143880 |
17 | 158945719401 |
18 | 794728597005 |
19 | 3973642985026 |
20 | 19868214925130 |
21 | 99341074625651 |
22 | 496705373128255 |
[1,5,26,130,651,3255,16276,81380,406901,2034505, 10172526,50862630,254313151,1271565755,6357828776, 31789143880,158945719401,794728597005, 3973642985026,19868214925130,99341074625651, 496705373128255] |