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.

User: Andrew Wall

Andrew Wall's wiki page.

Andrew Wall has authored 1 sequences.

A359502 a(n) = a(n-2)^2 + a(n-1) + 1 for n >= 2 with a(0) = 0 and a(1) = 1.

Original entry on oeis.org

0, 1, 2, 4, 9, 26, 108, 785, 12450, 628676, 155631177, 395389144154, 24221458643549484, 156332599536291235925201, 586679058977510608947573592591458, 24439881677774993432884951095586547256059481860
Offset: 0

Author

Andrew Wall, Jan 03 2023

Keywords

Crossrefs

Programs

  • Mathematica
    a[0] = 0; a[1] = 1; a[n_] := a[n] = a[n - 2]^2 + a[n - 1] + 1; Array[a, 16, 0] (* Amiram Eldar, Jan 05 2023 *)
  • Python
    # a generator
    def agen_q():
        a, b = 0, 1
        while 1:
            yield a
            a, b = b, (a * a) + b + 1
    f = agen_q(); print([next(f) for _ in range(20)])