A101990 - cp's OEIS frontend

A101990 a(1) = a(2) = 1, a(3) = 9; for n > 3, a(n) = 3a(n-1) - 3a(n-2) + 9*a(n-3).

n	a(n)
1	1
2	1
3	9
4	33
5	81
6	225
7	729
8	2241
9	6561
10	19521
11	59049
12	177633
13	531441
14	1592865
15	4782969
16	14353281
17	43046721
18	129127041
19	387420489
20	1162300833
21	3486784401
22	10460235105
23	31381059609
24	94143533121
25	282429536481
26	847287546561
27	2541865828329
28	7625600673633

[1, 1, 9, 33, 81, 225, 729, 2241, 6561, 19521, 59049, 177633, 531441, 1592865, 4782969, 14353281, 43046721, 129127041, 387420489, 1162300833, 3486784401, 10460235105, 31381059609, 94143533121, 282429536481, 847287546561, 2541865828329, 7625600673633]

cp's OEIS Frontend

A101990 a(1) = a(2) = 1, a(3) = 9; 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

A101990 a(1) = a(2) = 1, a(3) = 9; for n > 3, a(n) = 3*a(n-1) - 3*a(n-2) + 9*a(n-3).

Table of values

List of values

A101990 a(1) = a(2) = 1, a(3) = 9; for n > 3, a(n) = 3a(n-1) - 3a(n-2) + 9*a(n-3).