This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A103994 A129360 * A115361. 3
 1, 1, 1, -1, 0, 1, 1, 1, 0, 1, -1, 0, 0, 0, 1, -1, -1, 1, 0, 0, 1, -1, 0, 0, 0, 0, 0, 1, 1, 1, 0, 1, 0, 0, 0, 1, 0, 0, -1, 0, 0, 0, 0, 0, 1, -1, -1, 0, 0, 1, 0, 0, 0, 0, 1, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, -1, -1, 1, -1, 0, 1, 0, 0, 0, 0, 0, 1, -1, 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 Row sums = A104117: (1, 2, 0, 3, 0, 0, 0, 4, 0, 0,...). LINKS FORMULA A129360 * A115361 as infinite lower triangular matrices. EXAMPLE First few rows of the triangle are: 1; 1, 1; -1, 0, 1; 1, 1, 0, 1; -1, 0, 0, 0, 1; -1, -1, 1, 0, 0, 1; -1, 0, 0, 0, 0, 0, 1; 1, 1, 0, 1, 0, 0, 0, 1; ... PROG (PARI) tabl(nn) = {Tm = matrix(nn, nn, n, k, if (! (n % k), moebius(n/k), 0)); Tr = matrix(nn, nn, n, k, n--; k--; if ((n==k), 1, if (n==2*k+1, -1, 0))); Ti = Tr^(-1); Tp = Tm*Ti*Ti; for (n=1, nn, for (k=1, n, print1(Tp[n, k], ", "); ); print(); ); } CROSSREFS Cf. A104117, A129360, A115361. Sequence in context: A054524 A110471 A174854 * A051731 A135839 A071022 Adjacent sequences:  A103991 A103992 A103993 * A103995 A103996 A103997 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Apr 15 2007 EXTENSIONS More terms from Michel Marcus, Mar 28 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 | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.