A072257 - cp's OEIS frontend

A072257 a(n) = ((6n-17)4^n - 1)/3.

n	a(n)
0	-6
1	-15
2	-27
3	21
4	597
5	4437
6	25941
7	136533
8	677205
9	3233109
10	15029589
11	68506965
12	307582293
13	1364546901
14	5995058517
15	26127717717
16	113100805461
17	486762960213
18	2084490794325
19	8887718991189

[-6, -15, -27, 21, 597, 4437, 25941, 136533, 677205, 3233109, 15029589, 68506965, 307582293, 1364546901, 5995058517, 26127717717, 113100805461, 486762960213, 2084490794325, 8887718991189]

cp's OEIS Frontend

A072257 a(n) = ((6n-17)4^n - 1)/3.

Table of values

List of values

cp's OEIS Frontend

A072257 a(n) = ((6*n-17)*4^n - 1)/3.

Table of values

List of values

A072257 a(n) = ((6n-17)4^n - 1)/3.