A007581 - cp's OEIS frontend

A007581 a(n) = (2^n+1)*(2^n+2)/6.

n	a(n)
0	1
1	2
2	5
3	15
4	51
5	187
6	715
7	2795
8	11051
9	43947
10	175275
11	700075
12	2798251
13	11188907
14	44747435
15	178973355
16	715860651
17	2863377067
18	11453377195
19	45813246635
20	183252462251
21	733008800427
22	2932033104555
23	11728128223915
24	46912504507051
25	187650001250987

[1, 2, 5, 15, 51, 187, 715, 2795, 11051, 43947, 175275, 700075, 2798251, 11188907, 44747435, 178973355, 715860651, 2863377067, 11453377195, 45813246635, 183252462251, 733008800427, 2932033104555, 11728128223915, 46912504507051, 187650001250987]

cp's OEIS Frontend

A007581 a(n) = (2^n+1)*(2^n+2)/6.

Table of values

List of values