Number of sequences of balls colored with at most n colors such that exactly three balls are the same color as some other ball in the sequence.

A292998

Number of sequences of balls colored with at most n colors such that exactly three balls are the same color as some other ball in the sequence.

Terms

    a(0) =1a(1) =10a(2) =87a(3) =772a(4) =7285a(5) =74046a(6) =812875a(7) =9626632a(8) =122643657a(9) =1675253170a(10) =24449818591a(11) =379984902540

External references