A139549 - OEIS

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A139549

Triangle read by rows: T(n,k) = if n>=2*k and n<2*k*A014963(k-1) then k else 1 T(n,0)=1.

1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 1, 2, 1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 1, 2, 3, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 1, 1, 1, 1, 1, 1, 3, 4, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 5, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 3, 4, 5, 1, 1, 1, 1, 1, 1, 1, 1

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OFFSET

0,13

COMMENTS

Row products give A139550.

LINKS

Table of n, a(n) for n=0..104.

EXAMPLE

Row products of the triangle are:

1 = 1

1*1 = 1

1*1*1 = 1

1*1*1*1 = 1

1*1*2*1*1 = 2

1*1*2*1*1*1 = 2

1*1*2*3*1*1*1 = 6

1*1*2*3*1*1*1*1 = 6

1*1*1*3*4*1*1*1*1 = 12

PROG

(Excel) =if(and(row()-1>=(column()-1)*2; row()-1 < A014963(k-1)*(column()-1)*2); column()-1; 1)

CROSSREFS

Cf. A139550, A139547, A003418.

Sequence in context: A304886 A352080 A295632 * A216915 A280569 A140345

Adjacent sequences: A139546 A139547 A139548 * A139550 A139551 A139552

KEYWORD

nonn,tabl

AUTHOR

Mats Granvik, Apr 27 2008

STATUS

approved