The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A130266 A051340 * A128174. 1
 1, 1, 2, 4, 1, 3, 2, 5, 1, 4, 7, 2, 6, 1, 5, 3, 8, 2, 7, 1, 6, 10, 3, 9, 2, 8, 1, 7, 4, 11, 3, 10, 2, 9, 1, 8, 13, 4, 12, 3, 11, 2, 10, 1, 9, 5, 14, 4, 13, 3, 12, 2, 11, 1, 10, 16, 5, 15, 4, 14, 3, 13, 2, 12, 1, 11, 6, 17, 5, 16, 4, 15, 3, 14, 2, 13 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Row sums = A014255: (1, 3, 8, 12, 21, 27, 40,...). Left border = A123684: (1, 1, 4, 2, 7, 3, 10, 4,...). LINKS FORMULA A051340 * A128174 as infinite lower triangular matrices. EXAMPLE First few rows of the triangle are: 1; 1, 2; 4, 1, 3; 2, 5, 1, 4; 7, 2, 6, 1, 5; 3, 8, 2, 7, 1, 6; 10, 3, 9, 2, 8, 1, 7; ... MAPLE A128174 := proc(n, k)     if k > n or k < 1 then         0;     else         modp(k+n+1, 2) ;     end if; end proc: A051340 := proc(n, k)     if k = n then         n ;     elif k <= n then         1;     else         0;     end if; end proc: A130266 := proc(n, k)     add( A051340(n, j)*A128174(j, k), j=k..n) ; end proc: seq(seq(A130266(n, k), k=1..n), n=1..15) ; # R. J. Mathar, Aug 06 2016 CROSSREFS Cf. A051340, A128174, A014255, A123684. Sequence in context: A141843 A322169 A332084 * A261595 A211197 A258246 Adjacent sequences:  A130263 A130264 A130265 * A130267 A130268 A130269 KEYWORD nonn,tabl,easy AUTHOR Gary W. Adamson, May 18 2007 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.

Last modified July 24 05:05 EDT 2021. Contains 346273 sequences. (Running on oeis4.)