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A152717 Triangle T(n,k) read by rows: T(n,k) = 5^min(k, n-k) = 5^A004197(n,k). 5

%I

%S 1,1,1,1,5,1,1,5,5,1,1,5,25,5,1,1,5,25,25,5,1,1,5,25,125,25,5,1,1,5,

%T 25,125,125,25,5,1,1,5,25,125,625,125,25,5,1,1,5,25,125,625,625,125,

%U 25,5,1,1,5,25,125,625,3125,625,125,25,5,1

%N Triangle T(n,k) read by rows: T(n,k) = 5^min(k, n-k) = 5^A004197(n,k).

%C Row sums are: {1, 2, 7, 12, 37, 62, 187, 312, 937, 1562, 4687,...}

%F T(n,k) = 5^min(k, n-k). - _Philippe Deléham_, Feb 25 2014

%e {1},

%e {1, 1},

%e {1, 5, 1},

%e {1, 5, 5, 1},

%e {1, 5, 25, 5, 1},

%e {1, 5, 25, 25, 5, 1},

%e {1, 5, 25, 125, 25, 5, 1},

%e {1, 5, 25, 125, 125, 25, 5, 1},

%e {1, 5, 25, 125, 625, 125, 25, 5, 1},

%e {1, 5, 25, 125, 625, 625, 125, 25, 5, 1},

%e {1, 5, 25, 125, 625, 3125, 625, 125, 25, 5, 1}

%t Clear[a, k, m]; k = 5; a[0] = {1}; a[1] = {1, 1};

%t a[n_] := a[n] = Join[{1}, k*a[n - 2], {1}];

%t Table[a[n], {n, 0, 10}];

%t Flatten[%]

%Y Cf. A004197, A144464, A152714, A152716.

%K nonn,easy,tabl

%O 0,5

%A _Roger L. Bagula_ and _Gary W. Adamson_, Dec 11 2008

%E Better name from _Philippe Deléham_, Feb 25 2014

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Last modified July 26 13:40 EDT 2021. Contains 346294 sequences. (Running on oeis4.)