Binomial coefficients binomial(5n,n).

A001449

Binomial coefficients binomial(5n,n).

Terms

    a(0) =1a(1) =5a(2) =45a(3) =455a(4) =4845a(5) =53130a(6) =593775a(7) =6724520a(8) =76904685a(9) =886163135a(10) =10272278170a(11) =119653565850

External references