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.

A228749 Number of n X n binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.

Table of values

n a(n)
1 1
2 3
3 39
4 780
5 43862
6 4823826
7 1316714732
8 762713002760
9 1040109467257908
10 3118624187066762728
11 21501868781585259257676
12 331091404725670052219822756
13 11603262095526618070600084170304
14 914315533886530112431287075923892544

List of values

[1, 3, 39, 780, 43862, 4823826, 1316714732, 762713002760, 1040109467257908, 3118624187066762728, 21501868781585259257676, 331091404725670052219822756, 11603262095526618070600084170304, 914315533886530112431287075923892544]

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

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