A387478 - cp's OEIS frontend

A387478 a(n) = Sum_{k=0..floor(n/2)} 2^k * 3^(n-2k) binomial(k,n-2*k)^2.

n	a(n)
0	1
1	0
2	2
3	6
4	4
5	48
6	44
7	216
8	664
9	984
10	5216
11	9312
12	30160
13	93312
14	194528
15	717792
16	1674688
17	4842624
18	14554304
19	35517312
20	112151680
21	293213568
22	823387136
23	2409934848
24	6348908800
25	18760218624
26	51418362368
27	143838905856
28	414017065984
29	1132211048448
30	3255687793664

[1, 0, 2, 6, 4, 48, 44, 216, 664, 984, 5216, 9312, 30160, 93312, 194528, 717792, 1674688, 4842624, 14554304, 35517312, 112151680, 293213568, 823387136, 2409934848, 6348908800, 18760218624, 51418362368, 143838905856, 414017065984, 1132211048448, 3255687793664]

cp's OEIS Frontend

A387478 a(n) = Sum_{k=0..floor(n/2)} 2^k * 3^(n-2k) binomial(k,n-2*k)^2.

Table of values

List of values

cp's OEIS Frontend

A387478 a(n) = Sum_{k=0..floor(n/2)} 2^k * 3^(n-2*k) * binomial(k,n-2*k)^2.

Table of values

List of values

A387478 a(n) = Sum_{k=0..floor(n/2)} 2^k * 3^(n-2k) binomial(k,n-2*k)^2.