A099787 - cp's OEIS frontend

A099787 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^k * 3^(n-4*k).

n	a(n)
0	1
1	3
2	9
3	27
4	83
5	267
6	909
7	3267
8	12235
9	46983
10	182529
11	711099
12	2764619
13	10704147
14	41257341
15	158371011
16	605932099
17	2312728095
18	8812918161
19	33549513579
20	127652354627
21	485608571547
22	1847326271949
23	7028217617859
24	26742885359131

[1, 3, 9, 27, 83, 267, 909, 3267, 12235, 46983, 182529, 711099, 2764619, 10704147, 41257341, 158371011, 605932099, 2312728095, 8812918161, 33549513579, 127652354627, 485608571547, 1847326271949, 7028217617859, 26742885359131]

cp's OEIS Frontend

A099787 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^k * 3^(n-4*k).

Table of values

List of values

cp's OEIS Frontend

A099787 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3*k) * 2^k * 3^(n-4*k).

Table of values

List of values

A099787 a(n) = Sum_{k=0..floor(n/4)} C(n-k,3k) 2^k * 3^(n-4*k).