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!)
 A164679 Convolve A001399 with sequences which map to 2,3,5,7,11,13,17... A000040 then, by bending when needed, summarize the results in a triangular array. 0
 1, 2, 1, 5, 4, 2, 10, 9, 7, 3, 19, 18, 16, 11, 4, 33, 32, 30, 25, 16, 5, 57 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Apparently the terms can be constructed by fixing the generating function of the diagonal g_0(x) = 1/(1-x)/(1-x^2)/(1-x^3), A001399, and deriving the generating function of the i-th subdiagonal by g_i(x) = g_{i-1}(x)/(1-x^i), i>=1. - R. J. Mathar, May 17 2016 LINKS EXAMPLE 1; 2, 1; 5, 4, 2; 10, 9, 7, 3; 19, 18, 16, 11, 4; 33, 32, 30, 25, 16, 5; 57 CROSSREFS Cf. A000098 (first column), A164678 (a similar triangle). Diagonals are A001399, A000601, A097701, A117485, ... Sequence in context: A113350 A227372 A164678 * A275183 A275131 A280513 Adjacent sequences:  A164676 A164677 A164678 * A164680 A164681 A164682 KEYWORD easy,nonn,tabl,uned AUTHOR Alford Arnold, Sep 05 2009 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 April 5 13:14 EDT 2020. Contains 333241 sequences. (Running on oeis4.)