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!)
 A128132 A natural number transform, companion to A127701. 11
 1, -1, 2, 0, -1, 3, 0, 0, -1, 4, 0, 0, 0, -1, 5, 0, 0, 0, 0, -1, 6, 0, 0, 0, 0, 0, -1, 7, 0, 0, 0, 0, 0, 0, -1, 8, 0, 0, 0, 0, 0, 0, 0, -1, 9, 0, 0, 0, 0, 0, 0, 0, 0, -1, 10, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 11, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -1, 12 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Binomial transform is A128133. LINKS FORMULA T(n,n) = n. T(n,n-1) = -1. T(n,k) = 0 for k <> n, n-1. EXAMPLE Triangle T(n,k) (with rows n >= 1 and columns k = 1..n) begins:    1;   -1,  2;    0, -1,  3;    0,  0, -1,  4;    0,  0,  0, -1,  5;    0,  0,  0,  0, -1, 6;    ... MAPLE A128132 := proc(n, k)     if n = k then         n;     elif k = n-1 then         -1 ;     else         0 ;     end if; end proc: # R. J. Mathar, Apr 26 2016 MATHEMATICA {1}~Join~Table[PadLeft[{-1, n}, n], {n, 2, 12}] // Flatten (* Michael De Vlieger, Apr 26 2016 *) CROSSREFS Cf. A127701, A128133, A128134. Sequence in context: A085855 A280500 A309576 * A158821 A127701 A004199 Adjacent sequences:  A128129 A128130 A128131 * A128133 A128134 A128135 KEYWORD tabl,sign,easy,changed AUTHOR Gary W. Adamson, Feb 15 2007 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 August 4 16:34 EDT 2020. Contains 336202 sequences. (Running on oeis4.)