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!)
 A166240 Triangle read by rows, A000012 * A152140 as infinite lower triangular matrices. 1
 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 2, 2, 1, 1, 1, 3, 2, 2, 1, 1, 1, 3, 4, 2, 2, 1, 1, 1, 4, 4, 4, 2, 2, 1, 1, 1, 1, 4, 6, 4, 4, 2, 2, 1, 1, 1, 5, 6, 7, 4, 4, 2, 2, 1, 1, 1, 5, 9, 7, 7, 4, 4, 2, 2, 1, 1, 1, 6, 9, 11, 7, 7, 4, 4, 2, 2, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,8 COMMENTS Row sums = A036469, (partial sums of A000009). The triangle = partial sums of A152140 starting from the top down, by columns. LINKS FORMULA Triangle read by rows, A000012 * A152140, where A000012 = an infinite lower triangular matrix with all 1's: [1; 1,1; 1,1,1;...]. EXAMPLE First few rows of the triangle = 1; 1, 1; 1, 1, 1; 1, 2, 1, 1; 1, 2, 2, 1, 1; 1, 3, 2, 2, 1, 1; 1, 3, 4, 2, 2, 1, 1; 1, 4, 4, 4, 2, 2, 1, 1; 1, 4, 6, 4, 4, 2, 2, 1, 1; 1, 5, 6, 7, 4, 4, 2, 2, 1, 1; 1, 5, 9, 7, 7, 4, 4, 2, 2, 1, 1; 1, 6, 9, 11, 7, 7, 4, 4, 2, 2, 1, 1; 1, 6, 12, 11, 12, 7, 7, 4, 4, 2, 2, 1, 1; 1, 7, 12, 16, 12, 12, 7, 7, 4, 4, 2, 2, 1, 1; 1, 7, 16, 16, 18, 12, 12, 7, 7, 4, 4, 2, 2, 1, 1; 1, 8, 16, 23, 18, 19, 12, 19, 7, 7, 4, 4, 2, 2, 1, 1; ... CROSSREFS Sequence in context: A284249 A137350 A334607 * A219347 A114087 A215521 Adjacent sequences:  A166237 A166238 A166239 * A166241 A166242 A166243 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Oct 09 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 July 30 15:29 EDT 2021. Contains 346359 sequences. (Running on oeis4.)