This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A160637 Hankel transform of A114464(n+1). 2
 1, 1, -2, -8, -32, -128, 1024, 16384, 262144, 4194304, -134217728, -8589934592, -549755813888, -35184372088832, 4503599627370496, 1152921504606846976, 295147905179352825856, 75557863725914323419136 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Hankel transform of A114464(n) is A160636. LINKS G. C. Greubel, Table of n, a(n) for n = 0..114 FORMULA a(n) = (-2)^floor(C(n+1,2)/2). MATHEMATICA Table[(-2)^Floor[Binomial[n + 1, 2]/2], {n, 0, 50}] (* G. C. Greubel, May 03 2018 *) PROG (PARI) for(n=0, 50, print1((-2)^floor(binomial(n+1, 2)/2), ", ")) \\ G. C. Greubel, May 03 2018 (MAGMA) [(-2)^Floor(Binomial(n+1, 2)/2): n in [0..50]]; // G. C. Greubel, May 03 2018 CROSSREFS Sequence in context: A081294 A004171 A009117 * A183895 A228921 A150829 Adjacent sequences:  A160634 A160635 A160636 * A160638 A160639 A160640 KEYWORD easy,sign AUTHOR Paul Barry, May 21 2009 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 August 17 03:29 EDT 2018. Contains 313810 sequences. (Running on oeis4.)