The OEIS mourns the passing of Jim Simons and is grateful to the Simons Foundation for its support of research in many branches of science, including the OEIS.
The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 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 * A370425 A225097 A079665 Adjacent sequences: A113046 A113047 A113048 * A113050 A113051 A113052 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Oct 11 2005 STATUS approved

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

Last modified May 20 19:00 EDT 2024. Contains 372720 sequences. (Running on oeis4.)