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 A209728 1/4 the number of (n+1)X(n+1) 0..3 arrays with every 2X2 subblock having distinct edge sums 0
 22, 1096, 137888, 47572464, 45147495264, 121396901813560, 914481225452329872, 19676655455650623737848 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A209736 LINKS Table of n, a(n) for n=1..8. EXAMPLE Some solutions for n=4 ..2..3..2..2..3....1..3..2..2..0....3..1..1..1..3....3..3..0..1..0 ..1..1..0..1..1....2..3..0..1..0....2..0..3..2..3....1..2..2..2..0 ..2..3..3..3..0....0..1..0..2..2....1..0..1..0..3....1..3..0..1..0 ..1..1..0..1..1....2..3..3..3..0....1..3..3..0..2....0..2..0..2..0 ..2..3..2..3..0....0..0..2..1..1....0..0..2..0..3....3..2..3..2..3 CROSSREFS Sequence in context: A223781 A223715 A255957 * A319667 A038695 A160259 Adjacent sequences: A209725 A209726 A209727 * A209729 A209730 A209731 KEYWORD nonn AUTHOR R. H. Hardin Mar 12 2012 STATUS approved

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Last modified September 26 05:27 EDT 2023. Contains 365653 sequences. (Running on oeis4.)