A072258 - cp's OEIS frontend

A072258 a(n) = ((6n+1)4^n - 1)/3.

n	a(n)
0	0
1	9
2	69
3	405
4	2133
5	10581
6	50517
7	234837
8	1070421
9	4805973
10	21321045
11	93672789
12	408245589
13	1767200085
14	7605671253
15	32570168661
16	138870609237
17	589842175317
18	2496807654741
19	10536986432853

[0, 9, 69, 405, 2133, 10581, 50517, 234837, 1070421, 4805973, 21321045, 93672789, 408245589, 1767200085, 7605671253, 32570168661, 138870609237, 589842175317, 2496807654741, 10536986432853]

cp's OEIS Frontend

A072258 a(n) = ((6n+1)4^n - 1)/3.

Table of values

List of values

cp's OEIS Frontend

A072258 a(n) = ((6*n+1)*4^n - 1)/3.

Table of values

List of values

A072258 a(n) = ((6n+1)4^n - 1)/3.