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A254235 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock diagonal sum plus antidiagonal minimum nondecreasing horizontally and vertically 2
512, 2616, 10684, 41140, 150016, 514920, 1700100, 5487356, 17402796, 54388900, 168051612, 514608380, 1564152640, 4724495088, 14194815516, 42456223192, 126490940620, 375582012308, 1111890899408, 3283117868720, 9671825746548 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A254242

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 8*a(n-1) -22*a(n-2) +21*a(n-3) +11*a(n-4) -62*a(n-5) +112*a(n-6) -36*a(n-7) -224*a(n-8) +374*a(n-9) -222*a(n-10) -293*a(n-11) +1161*a(n-12) -1391*a(n-13) +478*a(n-14) +769*a(n-15) -1984*a(n-16) +2012*a(n-17) -533*a(n-18) -789*a(n-19) +1431*a(n-20) -1120*a(n-21) +233*a(n-22) +300*a(n-23) -436*a(n-24) +229*a(n-25) -75*a(n-26) +35*a(n-27) +51*a(n-28) -55*a(n-29) +32*a(n-30) -7*a(n-31) -10*a(n-32) +5*a(n-33) -3*a(n-34) +a(n-36)

EXAMPLE

Some solutions for n=4

..0..1..1....0..1..0....0..0..0....0..0..0....0..1..0....0..1..0....1..0..0

..1..1..1....1..1..0....0..0..0....0..0..1....0..1..0....0..0..0....1..0..0

..0..0..0....1..1..1....1..1..0....1..1..0....1..1..0....0..0..1....0..1..1

..1..1..1....1..1..0....1..1..0....1..0..0....0..0..0....1..1..1....1..1..0

..1..0..1....0..1..0....0..1..0....0..1..1....1..1..0....0..0..0....1..1..1

..0..0..1....0..0..1....1..0..1....1..1..0....0..1..0....0..0..0....1..0..1

CROSSREFS

Sequence in context: A255029 A257426 A254242 * A254775 A254728 A254721

Adjacent sequences:  A254232 A254233 A254234 * A254236 A254237 A254238

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2015

STATUS

approved

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Last modified January 17 18:02 EST 2020. Contains 330987 sequences. (Running on oeis4.)