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!)
 A038715 a(n) = floor(n/4)*ceiling((n+2)/4). 0
 0, 0, 0, 0, 2, 2, 2, 3, 6, 6, 6, 8, 12, 12, 12, 15, 20, 20, 20, 24, 30, 30, 30, 35, 42, 42, 42, 48, 56, 56, 56, 63, 72, 72, 72, 80, 90, 90, 90, 99, 110, 110, 110, 120, 132, 132, 132, 143, 156, 156, 156, 168, 182, 182, 182, 195, 210, 210, 210, 224, 240 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Index entries for linear recurrences with constant coefficients, signature (2,-2,2,0,-2,2,-2,1). FORMULA a(n) = 2*a(n-1) - 2*a(n-2) + 2*a(n-3) - 2*a(n-5) + 2*a(n-6) - 2*a(n-7) + a(n-8). - R. J. Mathar, Mar 11 2012 MATHEMATICA LinearRecurrence[{2, -2, 2, 0, -2, 2, -2, 1}, {0, 0, 0, 0, 2, 2, 2, 3}, 80] (* Harvey P. Dale, Nov 05 2014 *) CROSSREFS Sequence in context: A104856 A306393 A324763 * A293518 A057040 A096235 Adjacent sequences:  A038712 A038713 A038714 * A038716 A038717 A038718 KEYWORD nonn AUTHOR N. J. A. Sloane, May 02 2000 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 July 30 19:03 EDT 2021. Contains 346359 sequences. (Running on oeis4.)