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.

A217645 T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..2 nXk array.

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%I A217645 #6 Jul 22 2025 23:42:42
%S A217645 3,3,3,9,9,9,17,27,27,17,37,91,163,91,37,77,293,877,877,293,77,163,
%T A217645 959,5119,8363,5119,959,163,343,3121,29101,80653,80653,29101,3121,343,
%U A217645 723,10171,166193,779051,1348399,779051,166193,10171,723,1523,33141,949883
%N A217645 T(n,k)=Number of nXk arrays of the minimum value of corresponding elements and their horizontal, vertical or antidiagonal neighbors in a random 0..2 nXk array.
%C A217645 Table starts
%C A217645 ....3.......3..........9...........17..............37.................77
%C A217645 ....3.......9.........27...........91.............293................959
%C A217645 ....9......27........163..........877............5119..............29101
%C A217645 ...17......91........877.........8363...........80653.............779051
%C A217645 ...37.....293.......5119........80653.........1348399...........22516459
%C A217645 ...77.....959......29101.......779051........22516459..........644993621
%C A217645 ..163....3121.....166193......7531727.......374406369........18482872753
%C A217645 ..343...10171.....949883.....72877045......6249355897.......531602056509
%C A217645 ..723...33141....5424617....704989101....104219396757.....15267905480487
%C A217645 .1523..107985...30992313...6820892171...1738366122579....438705879899041
%C A217645 .3209..351855..177045523..65993636901..28998563675605..12606649476815151
%C A217645 .6761.1146471.1011403721.638497154509.483717812615381.362239882955092205
%H A217645 R. H. Hardin, <a href="/A217645/b217645.txt">Table of n, a(n) for n = 1..198</a>
%e A217645 Some solutions for n=3 k=4
%e A217645 ..1..0..0..2....0..0..0..2....1..1..0..0....0..0..0..0....1..1..0..0
%e A217645 ..0..0..0..2....0..0..1..2....1..1..0..0....0..1..0..0....0..0..0..0
%e A217645 ..0..0..0..2....0..1..1..2....1..2..2..2....1..2..0..0....0..0..0..2
%Y A217645 Column 1 is A217450
%K A217645 nonn,tabl
%O A217645 1,1
%A A217645 _R. H. Hardin_ Oct 09 2012