a(n) = Sum_{d|n} mu(n/d) * binomial(4*d,d) / (3*d+1).
A346935
a(n) = Sum_{d|n} mu(n/d) * binomial(4*d,d) / (3*d+1).
Terms
- a(0) =1a(1) =3a(2) =21a(3) =136a(4) =968a(5) =7059a(6) =53819a(7) =420592a(8) =3362238a(9) =27342916a(10) =225568797a(11) =1882926144a(12) =15875338989a(13) =134993712777
External references
- oeis: A346935