a(n) = (1/(4*n)) * Sum_{d|n} mu(n/d) * binomial(4*d,d).
A346578
a(n) = (1/(4*n)) * Sum_{d|n} mu(n/d) * binomial(4*d,d).
Terms
- a(0) =1a(1) =3a(2) =18a(3) =112a(4) =775a(5) =5598a(6) =42287a(7) =328640a(8) =2615085a(9) =21191125a(10) =174303162a(11) =1451424960a(12) =12211799223a(13) =103655906781a(14) =886568152950
External references
- oeis: A346578