A099621 - cp's OEIS frontend

A099621 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k+1) * 3^(n-k-1)*(4/3)^k.

n	a(n)
0	0
1	1
2	6
3	31
4	144
5	637
6	2730
7	11467
8	47508
9	194953
10	794574
11	3222583
12	13023192
13	52491349
14	211161138
15	848231779
16	3403688796
17	13647040225
18	54685016022
19	219030629455
20	876994213920
21	3510591943981
22	14050213040826
23	56224387958011

[0, 1, 6, 31, 144, 637, 2730, 11467, 47508, 194953, 794574, 3222583, 13023192, 52491349, 211161138, 848231779, 3403688796, 13647040225, 54685016022, 219030629455, 876994213920, 3510591943981, 14050213040826, 56224387958011]

cp's OEIS Frontend

A099621 a(n) = Sum_{k=0..floor(n/2)} binomial(n-k,k+1) * 3^(n-k-1)*(4/3)^k.

Table of values

List of values