This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A143353 Triangle read by rows, A127172 * A128407 = (A051731)^3 * A128407, 1<=k<=n. 1
 1, 3, -1, 3, 0, -1, 6, -3, 0, 0, 3, 0, 0, 0, -1, 9, -3, -3, 0, 0, 1, 3, 0, 0, 0, 0, 0, -1, 10, -6, 0, 0, 0, 0, 0, 0, 6, 0, -3, 0, 0, 0, 0, 0, 0, 9, -3, 0, 0, -3, 0, 0, 0, 0, 1, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 18, -9, -6, 0, 0, 3, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 9, -3, 0, 0, 0, 0, -3, 0, 0, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Left border = A007425. Right border = mu(n), A008683. Row sums = d(n), A000010: (1, 2, 2, 3, 2, 4, 2,...). LINKS FORMULA Triangle read by rows, A127172 * A128407 = (A051731)^3 * A128407, 1<=k<=n EXAMPLE First few rows of the triangle = 1; 3, -1; 3, 0, -1; 6, -3, 0, 0; 3, 0, 0, 0, -1; 9, -3, -3, 0, 0, 1; 3, 0, 0, 0, 0, 0, -1; 10, -6, 0, 0, 0, 0, 0, 0; 6, 0, -3, 0, 0, 0, 0, 0, 0; 9, -3, 0, 0, -3, 0, 0, 0, 0, 1; ... CROSSREFS Cf. A007425, A127172, A128407, A051731, A000010, A008683. Sequence in context: A131088 A136157 A266260 * A127172 A011087 A180021 Adjacent sequences:  A143350 A143351 A143352 * A143354 A143355 A143356 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 10 2008 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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 17 07:05 EDT 2018. Contains 316276 sequences. (Running on oeis4.)