The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A128407 Triangle read by rows: T(n,n) = mobius(n) on the diagonal, zero elsewhere. 21
 1, 0, -1, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS A128407 * [1,2,3,...] = n*mu(n), A055615: (1, -2, -3, 0, -5, 6, -7, 0, ...). A051731 * A128407 = A054524. A128407 * A051731 = A128408. LINKS Harvey P. Dale, Table of n, a(n) for n = 1..1000 FORMULA Infinite lower triangular matrix with mu(n), A008683, as the right border and the rest zeros. EXAMPLE First few rows of the triangle: 1; 0, -1; 0, 0, -1; 0, 0, 0, 0; 0, 0, 0, 0, -1; 0, 0, 0, 0, 0, 1; 0, 0, 0, 0, 0, 0, -1; ... MATHEMATICA Table[PadLeft[{MoebiusMu[n]}, n], {n, 10}]//Flatten (* Harvey P. Dale, Dec 29 2021 *) CROSSREFS Cf. A051731, A128408, A008683 (row sums and diagonal), A054524. Sequence in context: A074381 A179560 A341602 * A363800 A134286 A023531 Adjacent sequences: A128404 A128405 A128406 * A128408 A128409 A128410 KEYWORD tabl,sign,easy AUTHOR Gary W. Adamson, Mar 01 2007 EXTENSIONS Name improved . - R. J. Mathar, Aug 03 2015 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 September 29 02:45 EDT 2023. Contains 365749 sequences. (Running on oeis4.)