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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.

A234115 Number of (n+1)X(n+1) 0..2 arrays with every 2X2 subblock having the absolute values of all six edge and diagonal differences no larger than 1.

Table of values

n a(n)
1 31
2 1361
3 231713
4 157630963
5 427196005695
6 4625943683805313
7 200376051988817866625
8 34754816964141969688314115
9 24157262935852623408023272643359
10 67332158893994957162261589597358347857

List of values

[31, 1361, 231713, 157630963, 427196005695, 4625943683805313, 200376051988817866625, 34754816964141969688314115, 24157262935852623408023272643359, 67332158893994957162261589597358347857]

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

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