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A258888 Number of (n+2)X(2+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
900, 2304, 4489, 10680, 23409, 51188, 104329, 216395, 430336, 849760, 1635841, 3133971, 5904900, 11044072, 20421361, 37522132, 68376361, 123865010, 222994489, 399409023, 711929124, 1263316100, 2233035025, 3931870085, 6900957184 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A258894
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +4*a(n-2) -8*a(n-3) -2*a(n-5) -14*a(n-6) +34*a(n-7) +8*a(n-8) -8*a(n-9) +16*a(n-10) -58*a(n-11) -16*a(n-12) +14*a(n-13) -4*a(n-14) +48*a(n-15) +16*a(n-16) -6*a(n-17) -2*a(n-18) -18*a(n-19) -8*a(n-20) +2*a(n-23) +a(n-24) for n>27
EXAMPLE
Some solutions for n=4
..1..1..0..1....0..1..0..0....1..1..0..0....1..1..0..1....1..0..1..0
..1..0..0..0....1..0..1..1....1..1..0..1....1..0..0..0....1..0..1..1
..1..0..0..1....0..0..0..1....1..0..1..0....0..0..0..1....0..1..0..1
..1..0..0..0....0..0..0..1....1..0..0..1....0..0..0..1....1..0..1..1
..0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..1....0..0..0..1
..1..0..1..1....0..0..1..1....1..0..1..1....0..0..1..1....0..0..0..1
CROSSREFS
Sequence in context: A336680 A074853 A162143 * A287800 A246887 A232556
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 14 2015
STATUS
approved

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Last modified February 26 07:39 EST 2024. Contains 370335 sequences. (Running on oeis4.)