A001571 - cp's OEIS frontend

A001571 a(n) = 4*a(n-1) - a(n-2) + 1, with a(0) = 0, a(1) = 2.

n	a(n)
0	0
1	2
2	9
3	35
4	132
5	494
6	1845
7	6887
8	25704
9	95930
10	358017
11	1336139
12	4986540
13	18610022
14	69453549
15	259204175
16	967363152
17	3610248434
18	13473630585
19	50284273907
20	187663465044
21	700369586270
22	2613814880037
23	9754889933879
24	36405744855480
25	135868089488042

[0, 2, 9, 35, 132, 494, 1845, 6887, 25704, 95930, 358017, 1336139, 4986540, 18610022, 69453549, 259204175, 967363152, 3610248434, 13473630585, 50284273907, 187663465044, 700369586270, 2613814880037, 9754889933879, 36405744855480, 135868089488042]

cp's OEIS Frontend

A001571 a(n) = 4*a(n-1) - a(n-2) + 1, with a(0) = 0, a(1) = 2.

Table of values

List of values