A271388 - cp's OEIS frontend

A271388 a(n) = 4*a(n-1) + a(n-2) - n for n > 1, with a(0) = 0, a(1) = 1.

n	a(n)
0	0
1	1
2	2
3	6
4	22
5	89
6	372
7	1570
8	6644
9	28137
10	119182
11	504854
12	2138586
13	9059185
14	38375312
15	162560418
16	688616968
17	2917028273
18	12356730042
19	52343948422
20	221732523710
21	939274043241
22	3978828696652
23	16854588829826
24	71397184015932
25	302443324893529
26	1281170483590022

[0, 1, 2, 6, 22, 89, 372, 1570, 6644, 28137, 119182, 504854, 2138586, 9059185, 38375312, 162560418, 688616968, 2917028273, 12356730042, 52343948422, 221732523710, 939274043241, 3978828696652, 16854588829826, 71397184015932, 302443324893529, 1281170483590022]

cp's OEIS Frontend

A271388 a(n) = 4*a(n-1) + a(n-2) - n for n > 1, with a(0) = 0, a(1) = 1.

Table of values

List of values