A321957 - cp's OEIS frontend

A321957 a(n) = binomial(3n, n + 1)hypergeom([1, 1 - 2*n], [2 + n], -1).

n	a(n)
0	0
1	4
2	42
3	382
4	3302
5	27824
6	230964
7	1898712
8	15505590
9	126025204
10	1020732722
11	8245721686
12	66477664088
13	535118039200
14	4302260308416
15	34556369687312
16	277350672112822
17	2224673611151996
18	17835746776558638
19	142937183041928874
20	1145145456194522262
21	9171991364052010176

[0, 4, 42, 382, 3302, 27824, 230964, 1898712, 15505590, 126025204, 1020732722, 8245721686, 66477664088, 535118039200, 4302260308416, 34556369687312, 277350672112822, 2224673611151996, 17835746776558638, 142937183041928874, 1145145456194522262, 9171991364052010176]

cp's OEIS Frontend

A321957 a(n) = binomial(3n, n + 1)hypergeom([1, 1 - 2*n], [2 + n], -1).

Table of values

List of values

cp's OEIS Frontend

A321957 a(n) = binomial(3*n, n + 1)*hypergeom([1, 1 - 2*n], [2 + n], -1).

Table of values

List of values

A321957 a(n) = binomial(3n, n + 1)hypergeom([1, 1 - 2*n], [2 + n], -1).