A387625 - cp's OEIS frontend

A387625 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k).

n	a(n)
0	1
1	1
2	1
3	7
4	21
5	43
6	93
7	251
8	661
9	1587
10	3805
11	9499
12	23813
13	58691
14	144141
15	356491
16	883637
17	2184115
18	5391869
19	13325371
20	32953317
21	81459235
22	201299565
23	497518187
24	1229819541
25	3039854611
26	7513347421
27	18570354203
28	45900859333
29	113454099843
30	280422868685

[1, 1, 1, 7, 21, 43, 93, 251, 661, 1587, 3805, 9499, 23813, 58691, 144141, 356491, 883637, 2184115, 5391869, 13325371, 32953317, 81459235, 201299565, 497518187, 1229819541, 3039854611, 7513347421, 18570354203, 45900859333, 113454099843, 280422868685]

cp's OEIS Frontend

A387625 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k).

Table of values

List of values

cp's OEIS Frontend

A387625 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2*n-4*k+1,2*k).

Table of values

List of values

A387625 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(2n-4k+1,2*k).