A387600 - cp's OEIS frontend

A387600 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+2,2*k+1).

n	a(n)
0	1
1	2
2	3
3	8
4	25
5	62
6	139
7	340
8	877
9	2186
10	5311
11	13056
12	32497
13	80566
14	198595
15	490092
16	1212597
17	2999522
18	7411207
19	18311384
20	45265657
21	111902478
22	276579275
23	683566148
24	1689580733
25	4176276794
26	10322491919
27	25513684656
28	63061990401
29	155871106406
30	385266605779

[1, 2, 3, 8, 25, 62, 139, 340, 877, 2186, 5311, 13056, 32497, 80566, 198595, 490092, 1212597, 2999522, 7411207, 18311384, 45265657, 111902478, 276579275, 683566148, 1689580733, 4176276794, 10322491919, 25513684656, 63061990401, 155871106406, 385266605779]

cp's OEIS Frontend

A387600 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+2,2*k+1).

Table of values

List of values

cp's OEIS Frontend

A387600 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2*n-4*k+2,2*k+1).

Table of values

List of values

A387600 a(n) = (1/2) * Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+2,2*k+1).