A387650 - cp's OEIS frontend

A387650 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+1,2n-6*k).

n	a(n)
0	1
1	0
2	0
3	1
4	6
5	0
6	1
7	20
8	20
9	1
10	42
11	140
12	57
13	72
14	504
15	673
16	254
17	1320
18	3697
19	2796
20	3212
21	13729
22	20802
23	14612
24	40873
25	103232
26	105616
27	128129
28	391222
29	637840
30	613089
31	1296772
32	2984388
33	3658945
34	4744730
35	11570396
36	19628825
37	22729464
38	41870056
39	88630753
40	121927726
41	167430712

[1, 0, 0, 1, 6, 0, 1, 20, 20, 1, 42, 140, 57, 72, 504, 673, 254, 1320, 3697, 2796, 3212, 13729, 20802, 14612, 40873, 103232, 105616, 128129, 391222, 637840, 613089, 1296772, 2984388, 3658945, 4744730, 11570396, 19628825, 22729464, 41870056, 88630753, 121927726, 167430712]

cp's OEIS Frontend

A387650 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+1,2n-6*k).

Table of values

List of values

cp's OEIS Frontend

A387650 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+1,2*n-6*k).

Table of values

List of values

A387650 a(n) = Sum_{k=0..floor(n/3)} 2^(n-3k) binomial(2k+1,2n-6*k).