A213702 Half the number of 7X7 0..n symmetric arrays with no 2X2 subblock summing to 2n

68798, 88681187619, 1146407046198040, 1199143411128185584, 325754552781442854792, 33704464361612549676417, 1829651398830137742302620, 59594337869095766240501287, 1329775905386553460207679334

Offset

1,1

Comments

Row 6 of A213697

Links

R. H. Hardin, Table of n, a(n) for n = 1..10

Example

Some solutions for n=4
..0..1..2..3..3..4..2....4..2..1..3..0..1..4....4..4..2..1..4..1..0
..1..3..0..1..4..3..3....2..2..4..3..0..0..1....4..1..2..0..4..0..3
..2..0..0..3..4..2..2....1..4..2..4..2..3..0....2..2..1..0..0..0..2
..3..1..3..1..4..1..4....3..3..4..1..3..4..4....1..0..0..3..2..0..3
..3..4..4..4..3..1..0....0..0..2..3..4..4..3....4..4..0..2..3..4..3
..4..3..2..1..1..1..3....1..0..3..4..4..4..3....1..0..0..0..4..1..2
..2..3..2..4..0..3..2....4..1..0..4..3..3..0....0..3..2..3..3..2..0

Crossrefs

Sequence in context: A031845 A249315 A031863 * A233721 A121107 A046516

Adjacent sequences: A213699 A213700 A213701 * A213703 A213704 A213705

Keyword

nonn

Author

R. H. Hardin Jun 18 2012

Status

approved