A387551 - cp's OEIS frontend

A387551 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^k * binomial(2k+2,2n-4*k+1).

n	a(n)
0	1
1	0
2	4
3	4
4	12
5	40
6	44
7	224
8	304
9	992
10	2208
11	4480
12	13200
13	24320
14	68608
15	145856
16	345920
17	848256
18	1834432
19	4644864
20	10239488
21	24708096
22	57602048
23	132493312
24	318103808
25	724885504
26	1728687104
27	4003968000
28	9371413504
29	22045935616
30	51113446400
31	120583479296

[1, 0, 4, 4, 12, 40, 44, 224, 304, 992, 2208, 4480, 13200, 24320, 68608, 145856, 345920, 848256, 1834432, 4644864, 10239488, 24708096, 57602048, 132493312, 318103808, 724885504, 1728687104, 4003968000, 9371413504, 22045935616, 51113446400, 120583479296]

cp's OEIS Frontend

A387551 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^k * binomial(2k+2,2n-4*k+1).

Table of values

List of values

cp's OEIS Frontend

A387551 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^k * binomial(2*k+2,2*n-4*k+1).

Table of values

List of values

A387551 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^k * binomial(2k+2,2n-4*k+1).