A107767 - cp's OEIS frontend

A107767 a(n) = (1 + 3^n - 23^(n/2))/4 if n is even, (1 + 3^n - 43^((n-1)/2))/4 if n odd.

n	a(n)
1	0
2	1
3	4
4	16
5	52
6	169
7	520
8	1600
9	4840
10	14641
11	44044
12	132496
13	397852
14	1194649
15	3585040
16	10758400
17	32278480
18	96845281
19	290545684
20	871666576
21	2615029252
22	7845176329
23	23535617560
24	70607118400
25	211821620920
26	635465659921

[0, 1, 4, 16, 52, 169, 520, 1600, 4840, 14641, 44044, 132496, 397852, 1194649, 3585040, 10758400, 32278480, 96845281, 290545684, 871666576, 2615029252, 7845176329, 23535617560, 70607118400, 211821620920, 635465659921]

cp's OEIS Frontend

A107767 a(n) = (1 + 3^n - 23^(n/2))/4 if n is even, (1 + 3^n - 43^((n-1)/2))/4 if n odd.

Table of values

List of values

cp's OEIS Frontend

A107767 a(n) = (1 + 3^n - 2*3^(n/2))/4 if n is even, (1 + 3^n - 4*3^((n-1)/2))/4 if n odd.

Table of values

List of values

A107767 a(n) = (1 + 3^n - 23^(n/2))/4 if n is even, (1 + 3^n - 43^((n-1)/2))/4 if n odd.