A028576 - cp's OEIS frontend

A028576 a(n) = (1/(4n)) Sum_{d|n} mu(n/d) * binomial(2*d, d)^2.

n	a(n)
1	1
2	4
3	33
4	304
5	3175
6	35556
7	420665
8	5176000
9	65664000
10	853367900
11	11309870605
12	152342891952
13	2080240006923
14	28738242567524
15	401024083514775
16	5645275548076800
17	80084088088568947
18	1143862232096407392
19	16437995698573558421
20	237520818846111947600

[1, 4, 33, 304, 3175, 35556, 420665, 5176000, 65664000, 853367900, 11309870605, 152342891952, 2080240006923, 28738242567524, 401024083514775, 5645275548076800, 80084088088568947, 1143862232096407392, 16437995698573558421, 237520818846111947600]

cp's OEIS Frontend

A028576 a(n) = (1/(4n)) Sum_{d|n} mu(n/d) * binomial(2*d, d)^2.

Table of values

List of values

cp's OEIS Frontend

A028576 a(n) = (1/(4*n)) * Sum_{d|n} mu(n/d) * binomial(2*d, d)^2.

Table of values

List of values

A028576 a(n) = (1/(4n)) Sum_{d|n} mu(n/d) * binomial(2*d, d)^2.