a(n) = Sum_{k=0..n} Stirling2(n,k) * binomial(6*k,k) / (5*k + 1).

A346767

a(n) = Sum_{k=0..n} Stirling2(n,k) * binomial(6*k,k) / (5*k + 1).

Terms

    a(0) =1a(1) =1a(2) =7a(3) =70a(4) =855a(5) =11907a(6) =182714a(7) =3029040a(8) =53565875a(9) =1001599339a(10) =19674910572a(11) =404009742858

External references