a(n) = binomial(7*n,n)*(5*n+1)/(6*n+1).

A215551

a(n) = binomial(7*n,n)*(5*n+1)/(6*n+1).

Terms

    a(0) =1a(1) =6a(2) =77a(3) =1120a(4) =17199a(5) =272272a(6) =4395118a(7) =71916768a(8) =1188576675a(9) =19794795118a(10) =331670995656

External references