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A258519 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the two sums of the diagonal and antidiagonal minus the two sums of the central column and central row nondecreasing horizontally and vertically 1
512, 2371, 6516, 16196, 47704, 156873, 488240, 1356489, 3595084, 9838222, 27777116, 77335445, 208141440, 551798439, 1474962640, 3975082026, 10653614768, 28234277048, 74474840360, 196928705327, 521756834144, 1378970429074 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A258522

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -26*a(n-2) +44*a(n-3) -23*a(n-4) -56*a(n-5) -7*a(n-6) +480*a(n-7) -973*a(n-8) +412*a(n-9) +1761*a(n-10) -2196*a(n-11) -3393*a(n-12) +8720*a(n-13) -2593*a(n-14) -16840*a(n-15) +23470*a(n-16) +11156*a(n-17) -39087*a(n-18) +6704*a(n-19) +66632*a(n-20) -91824*a(n-21) -12160*a(n-22) +88000*a(n-23) -10048*a(n-24) -99584*a(n-25) +126720*a(n-26) -9216*a(n-27) -78848*a(n-28) +16384*a(n-29) +16384*a(n-30) for n>34

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A258522

Sequence in context: A223333 A135273 A258522 * A254568 A254561 A254907

Adjacent sequences:  A258516 A258517 A258518 * A258520 A258521 A258522

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 01 2015

STATUS

approved

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Last modified May 14 19:53 EDT 2021. Contains 343903 sequences. (Running on oeis4.)