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.

Previous Showing 11-11 of 11 results.

A301993 Number of n X n 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero.

Original entry on oeis.org

0, 2, 5, 74, 2856, 100176, 15243860, 3267873712, 1423142192108, 1493258497764034, 2656316754272813006, 10809582885066864547012, 85481211759186744525328998, 1368540960166632565900365694716
Offset: 1

Views

Author

R. H. Hardin, Mar 30 2018

Keywords

Comments

Diagonal of A301999.

Examples

			Some solutions for n=5
..0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..1
..0..0..1..0..1. .0..1..0..0..1. .0..0..1..0..0. .0..1..0..1..0
..0..0..1..1..1. .1..1..1..1..1. .1..1..1..0..0. .1..0..0..0..0
..0..1..1..0..1. .0..0..1..1..1. .1..1..1..1..1. .1..1..0..1..0
..0..0..0..1..1. .0..0..1..0..0. .1..0..0..0..0. .1..0..1..0..0

Crossrefs

Cf. A301999.
Previous Showing 11-11 of 11 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.