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 A232204 T(n,k)=Number of (n+1)X(k+1) 0..2 arrays with every element both >= and <= some horizontal, vertical or antidiagonal neighbor 9
 15, 109, 109, 685, 2129, 685, 4483, 39651, 39651, 4483, 29469, 745157, 2064527, 745157, 29469, 193531, 14015499, 108997581, 108997581, 14015499, 193531, 1270657, 263553379, 5765893981, 16237318767, 5765893981, 263553379, 1270657 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts ......15........109............685..............4483.................29469 .....109.......2129..........39651............745157..............14015499 .....685......39651........2064527.........108997581............5765893981 ....4483.....745157......108997581.......16237318767.........2425888162725 ...29469...14015499.....5765893981.....2425888162725......1024215443152687 ..193531..263553379...304936615565...362285582855051....432206209011195289 .1270657.4955798535.16125727718291.54098452658673021.182361235082538718699 LINKS R. H. Hardin, Table of n, a(n) for n = 1..143 FORMULA Empirical for column k: k=1: [linear recurrence of order 12] k=2: [order 38] for n>40 EXAMPLE Some solutions for n=2 k=4 ..0..1..1..0..0....0..0..2..2..2....0..1..0..2..2....0..0..2..2..2 ..0..2..0..0..1....0..2..2..0..0....0..1..0..0..1....0..1..1..2..1 ..0..2..1..0..1....1..2..2..2..2....0..0..0..1..1....0..0..0..0..0 CROSSREFS Sequence in context: A202255 A243212 A232124 * A232117 A232197 A347500 Adjacent sequences:  A232201 A232202 A232203 * A232205 A232206 A232207 KEYWORD nonn,tabl AUTHOR R. H. Hardin, Nov 20 2013 STATUS approved

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Last modified June 30 06:00 EDT 2022. Contains 354914 sequences. (Running on oeis4.)