A387477 - cp's OEIS frontend

A387477 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(k,n-3*k)^2.

n	a(n)
0	1
1	0
2	0
3	2
4	2
5	0
6	4
7	16
8	4
9	8
10	72
11	72
12	24
13	256
14	576
15	288
16	816
17	3200
18	3264
19	3104
20	14432
21	25728
22	20672
23	58752
24	157120
25	173184
26	257152
27	809600
28	1296000
29	1466368
30	3814400
31	8247296
32	10202368
33	18360320
34	46069760
35	71264768
36	100919808
37	238362624
38	457049088
39	635490304

[1, 0, 0, 2, 2, 0, 4, 16, 4, 8, 72, 72, 24, 256, 576, 288, 816, 3200, 3264, 3104, 14432, 25728, 20672, 58752, 157120, 173184, 257152, 809600, 1296000, 1466368, 3814400, 8247296, 10202368, 18360320, 46069760, 71264768, 100919808, 238362624, 457049088, 635490304]

cp's OEIS Frontend

A387477 a(n) = Sum_{k=0..floor(n/3)} 2^k * binomial(k,n-3*k)^2.

Table of values

List of values