cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A087733 Partial sums of A068639.

Original entry on oeis.org

0, 1, 1, 2, 4, 7, 9, 12, 14, 17, 19, 22, 26, 31, 35, 40, 46, 53, 59, 66, 74, 83, 91, 100, 108, 117, 125, 134, 144, 155, 165, 176, 186, 197, 207, 218, 230, 243, 255, 268, 280, 293, 305, 318, 332, 347, 361, 376, 392, 409, 425, 442, 460, 479, 497, 516, 534, 553, 571
Offset: 0

Views

Author

N. J. A. Sloane, Oct 01 2003

Keywords

Programs

  • Mathematica
    Join[{0}, Nest[Accumulate, (-1)^IntegerExponent[Range[100], 2], 2]] (* Paolo Xausa, Jun 04 2025 *)

Formula

a(0)=0, a(2n+1) = -a(n)-a(n+1)+n^2+n, a(2n+1) = -2a(n)+n^2+2n+1. - Ralf Stephan, Oct 16 2003

Extensions

More terms from Benoit Cloitre, Oct 04 2003