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 A213799 Number of n X n 0..7 symmetric arrays with every row summing to floor(n*7/2). 0
 1, 8, 226, 52544, 84662388, 1012226679296, 87098380004205128 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Column 7 of A213800. LINKS Table of n, a(n) for n=1..7. EXAMPLE Some solutions for n=4: ..4..4..5..1....7..0..0..7....2..3..7..2....1..1..5..7....5..4..4..1 ..4..6..0..4....0..3..6..5....3..4..0..7....1..2..4..7....4..0..3..7 ..5..0..2..7....0..6..6..2....7..0..5..2....5..4..5..0....4..3..2..5 ..1..4..7..2....7..5..2..0....2..7..2..3....7..7..0..0....1..7..5..1 CROSSREFS Cf. A213800. Sequence in context: A220546 A189445 A193786 * A316809 A299655 A033508 Adjacent sequences: A213796 A213797 A213798 * A213800 A213801 A213802 KEYWORD nonn,more AUTHOR R. H. Hardin, Jun 20 2012 STATUS approved

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Last modified June 8 18:04 EDT 2023. Contains 363165 sequences. (Running on oeis4.)