A036911 - cp's OEIS frontend

A036911 a(n) = (binomial(4n, 2n) + (-1)^nbinomial(2n, n)^2)/2.

n	a(n)
0	1
1	1
2	53
3	262
4	8885
5	60626
6	1778966
7	14168988
8	383358645
9	3355615450
10	85990654178
11	803232328548
12	19780031677718
13	193873026294052
14	4629016098160220
15	47101568276955512
16	1096960888092571317
17	11503661742608944170
18	262435310495071434602

[1, 1, 53, 262, 8885, 60626, 1778966, 14168988, 383358645, 3355615450, 85990654178, 803232328548, 19780031677718, 193873026294052, 4629016098160220, 47101568276955512, 1096960888092571317, 11503661742608944170, 262435310495071434602]

cp's OEIS Frontend

A036911 a(n) = (binomial(4n, 2n) + (-1)^nbinomial(2n, n)^2)/2.

Table of values

List of values

cp's OEIS Frontend

A036911 a(n) = (binomial(4*n, 2*n) + (-1)^n*binomial(2*n, n)^2)/2.

Table of values

List of values

A036911 a(n) = (binomial(4n, 2n) + (-1)^nbinomial(2n, n)^2)/2.