The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Thanks to everyone who made a donation during our annual appeal!
To see the list of donors, or make a donation, see the OEIS Foundation home page.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A143468 Triangle read by rows, A054525 * A127775, 1<=k<=n. 0
 1, -1, 3, -1, 0, 5, 0, -3, 0, 7, -1, 0, 0, 0, 9, 1, -3, -5, 0, 0, 11, -1, 0, 0, 0, 0, 0, 13, 0, 0, 0, -7, 0, 0, 0, 15, 0, 0, -5, 0, 0, 0, 0, 0, 17, 1, -3, 0, 0, -9, 0, 0, 0, 0, 19, -1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 21 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row sums = A140434: (1, 2, 4, 4, 8, 4, 12, 8, 12,...). Left border = mu(n), A008683. LINKS FORMULA Triangle read by rows, A054525 * A127775, 1<=k<=n. Mobius transform of an infinite lower triangular matrix with (1, 3, 5, 7,...) in the main diagonal and the rest zeros. EXAMPLE First few rows of the triangle = 1; -1, 3; -1, 0, 5; 0, -3, 0, 7; -1, 0, 0, 0, 9; 1, -3, -5, 0, 0, 11; -1, 0, 0, 0, 0, 0, 13; ... CROSSREFS Cf. A127775, A054525, A140434, A008683. Sequence in context: A207327 A319083 A045406 * A133728 A127627 A154792 Adjacent sequences:  A143465 A143466 A143467 * A143469 A143470 A143471 KEYWORD tabl,sign AUTHOR Gary W. Adamson, Aug 17 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified January 18 13:30 EST 2020. Contains 331007 sequences. (Running on oeis4.)