A318609 - cp's OEIS frontend

A318609 a(1) = 2, a(2) = 4, a(3) = 6; for n > 3, a(n) = 3a(n-1) - 3a(n-2) + 9*a(n-3).

n	a(n)
1	2
2	4
3	6
4	24
5	90
6	252
7	702
8	2160
9	6642
10	19764
11	58806
12	176904
13	532170
14	1595052
15	4780782
16	14346720
17	43053282
18	129146724
19	387400806
20	1162241784
21	3486843450
22	10460412252
23	31380882462
24	94143001680
25	282430067922
26	847289140884
27	2541864234006
28	7625595890664
29	22876797237930

[2, 4, 6, 24, 90, 252, 702, 2160, 6642, 19764, 58806, 176904, 532170, 1595052, 4780782, 14346720, 43053282, 129146724, 387400806, 1162241784, 3486843450, 10460412252, 31380882462, 94143001680, 282430067922, 847289140884, 2541864234006, 7625595890664, 22876797237930]

cp's OEIS Frontend

A318609 a(1) = 2, a(2) = 4, a(3) = 6; for n > 3, a(n) = 3a(n-1) - 3a(n-2) + 9*a(n-3).

Table of values

List of values

cp's OEIS Frontend

A318609 a(1) = 2, a(2) = 4, a(3) = 6; for n > 3, a(n) = 3*a(n-1) - 3*a(n-2) + 9*a(n-3).

Table of values

List of values

A318609 a(1) = 2, a(2) = 4, a(3) = 6; for n > 3, a(n) = 3a(n-1) - 3a(n-2) + 9*a(n-3).