A387554 - cp's OEIS frontend

A387554 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+2,2n-4*k+1).

n	a(n)
0	1
1	0
2	2
3	4
4	3
5	20
6	16
7	56
8	117
9	152
10	510
11	700
12	1671
13	3532
14	5772
15	14480
16	24761
17	52400
18	109114
19	198324
20	437899
21	821828
22	1670536
23	3423784
24	6547325
25	13666184
26	26654966
27	53492716
28	108440335
29	212433276
30	432672004
31	857090304
32	1713987777
33	3452225824
34	6839636530

[1, 0, 2, 4, 3, 20, 16, 56, 117, 152, 510, 700, 1671, 3532, 5772, 14480, 24761, 52400, 109114, 198324, 437899, 821828, 1670536, 3423784, 6547325, 13666184, 26654966, 53492716, 108440335, 212433276, 432672004, 857090304, 1713987777, 3452225824, 6839636530]

cp's OEIS Frontend

A387554 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+2,2n-4*k+1).

Table of values

List of values

cp's OEIS Frontend

A387554 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^(n-2*k) * binomial(2*k+2,2*n-4*k+1).

Table of values

List of values

A387554 a(n) = (1/2) * Sum_{k=0..floor(n/2)} 2^(n-2k) binomial(2k+2,2n-4*k+1).