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A258887 Number of (n+2)X(1+2) 0..1 arrays with no 3x3 subblock diagonal sum less than the antidiagonal sum or central row sum less than the central column sum 1
242, 900, 3036, 10201, 30870, 94249, 271350, 786769, 2190720, 6135529, 16733464, 45832900, 123292328, 332697600, 886883128, 2369450329, 6278170990, 16660871929, 43967201252, 116153500969, 305698600640, 805156263025 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 1 of A258894
LINKS
FORMULA
Empirical: a(n) = 5*a(n-1) +a(n-2) -38*a(n-3) +50*a(n-4) +12*a(n-5) -106*a(n-6) +374*a(n-7) -453*a(n-8) -237*a(n-9) +765*a(n-10) -1424*a(n-11) +1802*a(n-12) +486*a(n-13) -1738*a(n-14) +2108*a(n-15) -2944*a(n-16) -604*a(n-17) +2008*a(n-18) -1348*a(n-19) +2158*a(n-20) +534*a(n-21) -1310*a(n-22) +328*a(n-23) -657*a(n-24) -219*a(n-25) +417*a(n-26) +2*a(n-27) +46*a(n-28) +24*a(n-29) -38*a(n-30) -2*a(n-31) -a(n-32) -a(n-33) +a(n-34)
EXAMPLE
Some solutions for n=4
..1..1..0....0..1..0....1..0..0....1..0..1....1..0..0....0..1..0....0..1..0
..1..1..0....1..1..1....0..1..0....1..0..0....1..0..1....1..0..1....1..1..1
..1..0..1....0..0..1....1..0..1....1..0..1....1..0..1....0..1..0....1..0..1
..1..0..1....1..0..1....1..0..1....1..0..1....1..0..1....1..0..1....1..0..1
..0..1..1....0..1..1....0..0..0....1..1..1....0..1..0....0..0..1....1..1..1
..1..0..1....0..1..0....0..0..0....0..1..1....0..0..0....0..0..1....1..1..1
CROSSREFS
Sequence in context: A205594 A070284 A258894 * A234484 A160551 A258886
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 14 2015
STATUS
approved

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Last modified February 23 14:24 EST 2024. Contains 370283 sequences. (Running on oeis4.)