A387628 - cp's OEIS frontend

A387628 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k+1).

n	a(n)
0	1
1	3
2	5
3	9
4	29
5	81
6	185
7	429
8	1093
9	2785
10	6817
11	16613
12	41181
13	102441
14	253049
15	623693
16	1541557
17	3814929
18	9430545
19	23297397
20	57577997
21	142345721
22	351858985
23	869614109
24	2149341925
25	5312698977
26	13131636417
27	32457015109
28	80223121469
29	198288112969
30	490110342873

[1, 3, 5, 9, 29, 81, 185, 429, 1093, 2785, 6817, 16613, 41181, 102441, 253049, 623693, 1541557, 3814929, 9430545, 23297397, 57577997, 142345721, 351858985, 869614109, 2149341925, 5312698977, 13131636417, 32457015109, 80223121469, 198288112969, 490110342873]

cp's OEIS Frontend

A387628 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k+1).

Table of values

List of values

cp's OEIS Frontend

A387628 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2*n-4*k+1,2*k+1).

Table of values

List of values

A387628 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k+1).