Number of partitions of 4*5^n into powers of 5, also equals column 1 of triangle A111820, which shifts columns left and up under matrix 5th power.

A111821

Number of partitions of 4*5^n into powers of 5, also equals column 1 of triangle A111820, which shifts columns left and up under matrix 5th power.

Terms

    a(0) =1a(1) =5a(2) =55a(3) =2055a(4) =291430a(5) =165397680a(6) =390075741430

External references