A387481 - cp's OEIS frontend

A387481 a(n) = Sum_{k=0..floor(n/2)} 3^k * 2^(n-2k) binomial(k,n-2*k)^2.

n	a(n)
0	1
1	0
2	3
3	6
4	9
5	72
6	63
7	486
8	1053
9	2808
10	11907
11	22518
12	99225
13	246888
14	755487
15	2554902
16	6488829
17	23112216
18	63506835
19	198653958
20	623336553
21	1781565192
22	5807475711
23	16898655942
24	52699192029
25	161995971384
26	484990399395
27	1525112887446
28	4572778238649
29	14184781485480
30	43472894580063

[1, 0, 3, 6, 9, 72, 63, 486, 1053, 2808, 11907, 22518, 99225, 246888, 755487, 2554902, 6488829, 23112216, 63506835, 198653958, 623336553, 1781565192, 5807475711, 16898655942, 52699192029, 161995971384, 484990399395, 1525112887446, 4572778238649, 14184781485480, 43472894580063]

cp's OEIS Frontend

A387481 a(n) = Sum_{k=0..floor(n/2)} 3^k * 2^(n-2k) binomial(k,n-2*k)^2.

Table of values

List of values

cp's OEIS Frontend

A387481 a(n) = Sum_{k=0..floor(n/2)} 3^k * 2^(n-2*k) * binomial(k,n-2*k)^2.

Table of values

List of values

A387481 a(n) = Sum_{k=0..floor(n/2)} 3^k * 2^(n-2k) binomial(k,n-2*k)^2.