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A113049 Triangle of sums of Jacobsthal numbers related to binomial(4n,n)/(3n+1) mod 4. 1
3, 11, 13, 43, 45, 53, 171, 173, 181, 213, 683, 685, 693, 725, 853, 2731, 2733, 2741, 2773, 2901, 3413, 10923, 10925, 10933, 10965, 11093, 11605, 13653, 43691, 43693, 43701, 43733, 43861, 44373, 46421, 54613, 174763, 174765, 174773, 174805, 174933 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

First column is A007583(n+1). Main diagonal is A072197. Conjecture: A113048(n)=2 only if n=T(i,j).

LINKS

Table of n, a(n) for n=0..40.

FORMULA

T(n, k)=if(k<=n, J(2n+3)+2J(2k), 0), J(n)=A001045(n).

EXAMPLE

Rows begin

3;

11, 13;

43, 45, 53;

171, 173, 181, 213;

683, 685, 693, 725, 683;

2731,2733, 2741, 2773, 2901, 3413;

CROSSREFS

Sequence in context: A168454 A181086 A274343 * A225097 A079665 A281728

Adjacent sequences:  A113046 A113047 A113048 * A113050 A113051 A113052

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Oct 11 2005

STATUS

approved

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Last modified June 20 17:51 EDT 2019. Contains 324234 sequences. (Running on oeis4.)