login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons 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; text; internal format)
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: A275215 A304886 A295632 * A216915 A280569 A140345

Adjacent sequences:  A139546 A139547 A139548 * A139550 A139551 A139552

KEYWORD

nonn,tabl

AUTHOR

Mats Granvik, Apr 27 2008

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified August 14 01:25 EDT 2020. Contains 336473 sequences. (Running on oeis4.)