login
This site is supported by donations to The OEIS Foundation.
Logo

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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, 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 (list; table; graph; refs; listen; history; internal format)
OFFSET

0,13

COMMENTS

Row products give A139550.

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 cell formula) =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: A030561 A202053 A074064 * A130782 A177706 A055457

Adjacent sequences:  A139546 A139547 A139548 * A139550 A139551 A139552

KEYWORD

nonn,tabl

AUTHOR

Mats O. Granvik (mgranvik(AT)abo.fi), Apr 27 2008

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Transforms | Puzzles | Hot | Classics
Recent Additions | More pages | Superseeker | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement .

Last modified February 15 13:25 EST 2012. Contains 205801 sequences.