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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
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, 25, 125, 125, 25, 5, 1, 1, 5, 25, 125, 625, 125, 25, 5, 1, 1, 5, 25, 125, 625, 625, 125, 25, 5, 1, 1, 5, 25, 125, 625, 3125, 625, 125, 25, 5, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

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

LINKS

Table of n, a(n) for n=0..65.

FORMULA

T(n,k) = 5^min(k, n-k). - Philippe Deléham, Feb 25 2014

EXAMPLE

{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, 25, 125, 125, 25, 5, 1},

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

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

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

MATHEMATICA

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

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

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

Flatten[%]

CROSSREFS

Cf. A004197, A144464, A152714, A152716.

Sequence in context: A237888 A286462 A046607 * A071856 A242133 A144221

Adjacent sequences:  A152714 A152715 A152716 * A152718 A152719 A152720

KEYWORD

nonn,easy,tabl

AUTHOR

Roger L. Bagula and Gary W. Adamson, Dec 11 2008

EXTENSIONS

Better name from Philippe Deléham, Feb 25 2014

STATUS

approved

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Last modified October 15 04:33 EDT 2019. Contains 328026 sequences. (Running on oeis4.)