n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 4 |
4 | 17 |
5 | 80 |
6 | 407 |
7 | 2160 |
8 | 11859 |
9 | 66754 |
10 | 383210 |
11 | 2234921 |
12 | 13204685 |
13 | 78870454 |
14 | 475453371 |
15 | 2888991879 |
16 | 17675743626 |
17 | 108801199823 |
18 | 673302178725 |
19 | 4186513098755 |
20 | 26142455226568 |
21 | 163873586066647 |
22 | 1030820865387599 |
23 | 6504789754356175 |
24 | 41166205256238155 |
25 | 261217480924768212 |
26 | 1661598566523216015 |
[1,1,4,17,80,407,2160,11859,66754,383210,2234921, 13204685,78870454,475453371,2888991879, 17675743626,108801199823,673302178725, 4186513098755,26142455226568,163873586066647, 1030820865387599,6504789754356175, 41166205256238155,261217480924768212, 1661598566523216015] |