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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.

A186906 Number of (n+2)X(n+2) 0..6 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

Table of values

n a(n)
1 2066505
2 2974946682
3 4813465754996
4 8185872059408158
5 14077041692560748494
6 23991605690718487651365
7 40128119810449322920431346
8 65662514004587268399842833783

List of values

[2066505, 2974946682, 4813465754996, 8185872059408158, 14077041692560748494, 23991605690718487651365, 40128119810449322920431346, 65662514004587268399842833783]

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

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