A383280 - cp's OEIS frontend

A383280 a(n) = (3/2)^n * Sum_{k=0..n} (1/6)^k * (2k)! (n-k)! * binomial(n,k)^2.

n	a(n)
0	1
1	2
2	9
3	72
4	954
5	19980
6	624510
7	27420120
8	1607036760
9	120942324720
10	11351106055800
11	1298791163577600
12	177888712528573200
13	28728740092874421600
14	5401708378739722249200
15	1169716267087957140552000
16	288993599402729842084464000
17	80796133625685147464322528000

[1, 2, 9, 72, 954, 19980, 624510, 27420120, 1607036760, 120942324720, 11351106055800, 1298791163577600, 177888712528573200, 28728740092874421600, 5401708378739722249200, 1169716267087957140552000, 288993599402729842084464000, 80796133625685147464322528000]

cp's OEIS Frontend

A383280 a(n) = (3/2)^n * Sum_{k=0..n} (1/6)^k * (2k)! (n-k)! * binomial(n,k)^2.

Table of values

List of values

cp's OEIS Frontend

A383280 a(n) = (3/2)^n * Sum_{k=0..n} (1/6)^k * (2*k)! * (n-k)! * binomial(n,k)^2.

Table of values

List of values

A383280 a(n) = (3/2)^n * Sum_{k=0..n} (1/6)^k * (2k)! (n-k)! * binomial(n,k)^2.