Quintuple factorial numbers: Product_{k = 0..n-1} (5*k + 4).

A008546

Quintuple factorial numbers: Product_{k = 0..n-1} (5*k + 4).

Terms

    a(0) =1a(1) =4a(2) =36a(3) =504a(4) =9576a(5) =229824a(6) =6664896a(7) =226606464a(8) =8837652096a(9) =388856692224

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