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

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