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.

A348686 Array read by ascending antidiagonals: T(n, k) = P(n, k) where P(n, x) are the scaled Mandelbrot-Larsen polynomials defined in A347928.

Original entry on oeis.org

1, 3, 2, 6, 8, 3, 45, 32, 15, 4, 126, 256, 90, 24, 5, 750, 1536, 885, 192, 35, 6, 2796, 12288, 8010, 2304, 350, 48, 7, 19389, 90112, 85590, 27648, 5005, 576, 63, 8, 75894, 753664, 913140, 374784, 74550, 9600, 882, 80, 9
Offset: 1

Views

Author

Peter Luschny, Oct 29 2021

Keywords

Examples

			Array starts:
[1] 1,     2,      3,        4,        5,         6,          7, ...
[2] 3,     8,      15,       24,       35,        48,         63, ...
[3] 6,     32,     90,       192,      350,       576,        882, ...
[4] 45,    256,    885,      2304,     5005,      9600,       16821, ...
[5] 126,   1536,   8010,     27648,    74550,     170496,     346626, ...
[6] 750,   12288,  85590,    374784,   1229550,   3317760,    7778358, ...
[7] 2796,  90112,  913140,   5210112,  21017500,  67239936,   182244132, ...
[8] 19389, 753664, 10384845, 75890688, 374119165, 1415184384, 4428038349, ...
Seen as a triangle:
[1] 1;
[2] 3,     2;
[3] 6,     8,      3;
[4] 45,    32,     15,     4;
[5] 126,   256,    90,     24,     5;
[6] 750,   1536,   885,    192,    35,    6;
[7] 2796,  12288,  8010,   2304,   350,   48,   7;
[8] 19389, 90112,  85590,  27648,  5005,  576,  63,  8;
[9] 75894, 753664, 913140, 374784, 74550, 9600, 882, 80, 9;
		

Crossrefs

Programs

  • Maple
    # Polynomials M are defined in A347928.
    P := (n, x) -> 2^(2*n-1)*M(n, x):
    row := (n, len) -> seq(P(n, k), k = 1..len):
    for n from 1 to 8 do row(n, 8) od;