A001353 - cp's OEIS frontend

A001353 a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.

n	a(n)
0	0
1	1
2	4
3	15
4	56
5	209
6	780
7	2911
8	10864
9	40545
10	151316
11	564719
12	2107560
13	7865521
14	29354524
15	109552575
16	408855776
17	1525870529
18	5694626340
19	21252634831
20	79315912984
21	296011017105
22	1104728155436
23	4122901604639
24	15386878263120
25	57424611447841
26	214311567528244

[0, 1, 4, 15, 56, 209, 780, 2911, 10864, 40545, 151316, 564719, 2107560, 7865521, 29354524, 109552575, 408855776, 1525870529, 5694626340, 21252634831, 79315912984, 296011017105, 1104728155436, 4122901604639, 15386878263120, 57424611447841, 214311567528244]

cp's OEIS Frontend

A001353 a(n) = 4*a(n-1) - a(n-2) with a(0) = 0, a(1) = 1.

Table of values

List of values