A387648 - cp's OEIS frontend

A387648 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k,2n-6*k).

n	a(n)
0	1
1	0
2	0
3	1
4	2
5	0
6	1
7	12
8	4
9	1
10	30
11	60
12	9
13	56
14	280
15	225
16	106
17	840
18	1681
19	852
20	2012
21	7393
22	8102
23	6116
24	24089
25	48288
26	39312
27	69889
28	206354
29	268496
30	264993
31	715868
32	1419892
33	1498177
34	2407662
35	5980620
36	8659497
37	10078152
38	21975496
39	42559393
40	52699770
41	81920920
42	178653105

[1, 0, 0, 1, 2, 0, 1, 12, 4, 1, 30, 60, 9, 56, 280, 225, 106, 840, 1681, 852, 2012, 7393, 8102, 6116, 24089, 48288, 39312, 69889, 206354, 268496, 264993, 715868, 1419892, 1498177, 2407662, 5980620, 8659497, 10078152, 21975496, 42559393, 52699770, 81920920, 178653105]

cp's OEIS Frontend

A387648 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k,2n-6*k).

Table of values

List of values

cp's OEIS Frontend

A387648 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k,2*n-6*k).

Table of values

List of values

A387648 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k,2n-6*k).