A387649 - cp's OEIS frontend

A387649 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k).

n	a(n)
0	1
1	0
2	1
3	6
4	1
5	20
6	21
7	42
8	141
9	128
10	505
11	782
12	1465
13	3852
14	5501
15	14290
16	26053
17	49464
18	113313
19	195446
20	433585
21	841732
22	1629285
23	3477754
24	6520445
25	13583472
26	26955209
27	52921182
28	109117737
29	212250492
30	431217101
31	861537698
32	1706182325
33	3460479528
34	6839829361

[1, 0, 1, 6, 1, 20, 21, 42, 141, 128, 505, 782, 1465, 3852, 5501, 14290, 26053, 49464, 113313, 195446, 433585, 841732, 1629285, 3477754, 6520445, 13583472, 26955209, 52921182, 109117737, 212250492, 431217101, 861537698, 1706182325, 3460479528, 6839829361]

cp's OEIS Frontend

A387649 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k).

Table of values

List of values

cp's OEIS Frontend

A387649 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k+1,2*n-4*k).

Table of values

List of values

A387649 a(n) = Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+1,2n-4*k).