a(n) is the smallest nonnegative integer such that a(n)! contains a string of exactly n consecutive 9's.

A254717

a(n) is the smallest nonnegative integer such that a(n)! contains a string of exactly n consecutive 9's.

Terms

    a(0) =0a(1) =12a(2) =11a(3) =36a(4) =99a(5) =207a(6) =629a(7) =3982a(8) =13216a(9) =24090a(10) =65698a(11) =131076a(12) =176801a(13) =2074822a(14) =5203944a(15) =3716991

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