A213700 Half the number of 5X5 0..n symmetric arrays with no 2X2 subblock summing to 2n

529, 750261, 109820000, 4286833981, 83545858925, 976919547736, 8159542628448, 51964311225934, 271341777491743, 1197645088919101, 4637119560078960, 16013821321719463, 50395763900241707, 145985579644461562

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