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 A224643 Number of (n+2)X(n+2) 0..1 matrices with each 3X3 subblock having the same population 0
 512, 2688, 10304, 31616, 115328, 356352, 983168, 3220992, 9400448, 25481600 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A224651 LINKS Table of n, a(n) for n=1..10. EXAMPLE Some solutions for n=2 ..0..1..0..0....0..0..1..1....1..0..0..0....0..1..1..0....0..0..1..0 ..0..1..1..0....0..1..1..0....0..0..1..1....0..1..0..1....1..1..0..1 ..0..1..1..0....1..1..0..0....1..1..1..1....1..0..0..0....0..0..0..0 ..0..1..0..0....0..1..0..1....1..0..0..0....0..1..1..0....1..0..0..1 CROSSREFS Sequence in context: A254998 A254991 A186840 * A186832 A254553 A254483 Adjacent sequences: A224640 A224641 A224642 * A224644 A224645 A224646 KEYWORD nonn AUTHOR R. H. Hardin Apr 13 2013 STATUS approved

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Last modified June 2 10:58 EDT 2023. Contains 363097 sequences. (Running on oeis4.)