A145563 - cp's OEIS frontend

A145563 a(0)=0 and a(n+1) = 3*a(n) + 2^(n+2).

n	a(n)
0	0
1	4
2	20
3	76
4	260
5	844
6	2660
7	8236
8	25220
9	76684
10	232100
11	700396
12	2109380
13	6344524
14	19066340
15	57264556
16	171924740
17	516036364
18	1548633380
19	4646948716
20	13942943300
21	41833024204
22	125507461220
23	376539160876
24	1129651037060
25	3389020220044
26	10167194877860

[0, 4, 20, 76, 260, 844, 2660, 8236, 25220, 76684, 232100, 700396, 2109380, 6344524, 19066340, 57264556, 171924740, 516036364, 1548633380, 4646948716, 13942943300, 41833024204, 125507461220, 376539160876, 1129651037060, 3389020220044, 10167194877860]

cp's OEIS Frontend

A145563 a(0)=0 and a(n+1) = 3*a(n) + 2^(n+2).

Table of values

List of values