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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.

A268404 Number of fixed polyominoes that have a width and height of n.

Table of values

n a(n)
1 1
2 5
3 111
4 7943
5 1890403
6 1562052227
7 4617328590967
8 49605487608825311
9 1951842619769780119767
10 282220061839181920696642671
11 150134849621798165832163223922131
12 293909551918134914019004192289440616787
13 2116817972794640259940977362779552773322908743

List of values

[1, 5, 111, 7943, 1890403, 1562052227, 4617328590967, 49605487608825311, 1951842619769780119767, 282220061839181920696642671, 150134849621798165832163223922131, 293909551918134914019004192289440616787, 2116817972794640259940977362779552773322908743]

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

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