A004987 - cp's OEIS frontend

A004987 a(n) = (3^n/n!)Product_{k=0..n-1} (3k + 1). 3-central binomial coefficients.

n	a(n)
0	1
1	3
2	18
3	126
4	945
5	7371
6	58968
7	480168
8	3961386
9	33011550
10	277297020
11	2344420260
12	19927572210
13	170150808870
14	1458435504600
15	12542545339560
16	108179453553705
17	935434098376155
18	8107095519260010
19	70403724246205350
20	612512400941986545
21	5337608065351597035
22	46582761297613937760

[1, 3, 18, 126, 945, 7371, 58968, 480168, 3961386, 33011550, 277297020, 2344420260, 19927572210, 170150808870, 1458435504600, 12542545339560, 108179453553705, 935434098376155, 8107095519260010, 70403724246205350, 612512400941986545, 5337608065351597035, 46582761297613937760]

cp's OEIS Frontend

A004987 a(n) = (3^n/n!)Product_{k=0..n-1} (3k + 1). 3-central binomial coefficients.

Table of values

List of values

cp's OEIS Frontend

A004987 a(n) = (3^n/n!)*Product_{k=0..n-1} (3*k + 1). 3-central binomial coefficients.

Table of values

List of values

A004987 a(n) = (3^n/n!)Product_{k=0..n-1} (3k + 1). 3-central binomial coefficients.