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A213700 Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n 1
529, 750261, 109820000, 4286833981, 83545858925, 976919547736, 8159542628448, 51964311225934, 271341777491743, 1197645088919101, 4637119560078960, 16013821321719463, 50395763900241707, 145985579644461562 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A213697

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..33

EXAMPLE

Some solutions for n=4

..0..3..2..3..4....3..0..0..1..4....0..4..0..2..3....0..1..2..2..4

..3..4..3..1..3....0..2..3..1..1....4..2..0..3..3....1..2..4..1..0

..2..3..4..2..4....0..3..2..4..3....0..0..4..3..1....2..4..2..3..1

..3..1..2..4..1....1..1..4..1..4....2..3..3..2..0....2..1..3..1..4

..4..3..4..1..1....4..1..3..4..3....3..3..1..0..4....4..0..1..4..4

CROSSREFS

Sequence in context: A206955 A207987 A207219 * A013773 A013907 A048455

Adjacent sequences:  A213697 A213698 A213699 * A213701 A213702 A213703

KEYWORD

nonn

AUTHOR

R. H. Hardin Jun 18 2012

STATUS

approved

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Last modified July 22 17:02 EDT 2019. Contains 325225 sequences. (Running on oeis4.)