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 A213697 T(n,k)=Half the number of (n+1)X(n+1) symmetric 0..k arrays with no 2X2 subblock summing to 2k 14
 3, 11, 13, 28, 192, 70, 56, 1320, 7827, 529, 99, 5470, 208072, 750261, 5148, 159, 17499, 2322599, 109820000, 168382284, 68798, 240, 45892, 16537086, 4286833981, 193946752094, 88681187619, 1220409, 344, 105856, 84059234, 83545858925 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Table starts .....3..........11...............28..................56....................99 ....13.........192.............1320................5470.................17499 ....70........7827...........208072.............2322599..............16537086 ...529......750261........109820000..........4286833981...........83545858925 ..5148...168382284.....193946752094......34389632236877......2256314178023600 .68798.88681187619.1146407046198040.1199143411128185584.325754552781442854792 LINKS R. H. Hardin, Table of n, a(n) for n = 1..73 EXAMPLE Some solutions for n=4 k=4 ..0..4..0..2..3....1..2..4..4..0....2..4..3..3..2....3..4..3..1..2 ..4..2..0..3..3....2..1..3..4..1....4..2..3..3..1....4..2..2..1..0 ..0..0..4..3..1....4..3..2..1..0....3..3..2..2..3....3..2..3..4..2 ..2..3..3..2..0....4..4..1..0..0....3..3..2..3..2....1..1..4..2..4 ..3..3..1..0..4....0..1..0..0..4....2..1..3..2..2....2..0..2..4..1 CROSSREFS Row 1 is A182260(n+1) Sequence in context: A168164 A296933 A270543 * A287348 A019374 A033680 Adjacent sequences:  A213694 A213695 A213696 * A213698 A213699 A213700 KEYWORD nonn,tabl AUTHOR R. H. Hardin Jun 18 2012 STATUS approved

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Last modified August 12 16:32 EDT 2022. Contains 356077 sequences. (Running on oeis4.)