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A254838 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the medians of the diagonal and antidiagonal minus the two sums of the central row and column nondecreasing horizontally and vertically 2
512, 2485, 8776, 30182, 99200, 293012, 794128, 2084773, 5392400, 13573624, 33204574, 80124746, 192349472, 458091034, 1080492808, 2534264261, 5930184322, 13838765283, 32185821994, 74693933546, 173167669926, 401063439075 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A254845

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) -3*a(n-2) -4*a(n-3) +19*a(n-4) -52*a(n-5) +16*a(n-6) +84*a(n-7) -81*a(n-8) +54*a(n-9) +241*a(n-10) -548*a(n-11) -247*a(n-12) +1186*a(n-13) -1497*a(n-14) +970*a(n-15) +2083*a(n-16) -4166*a(n-17) +1689*a(n-18) +1372*a(n-19) -2626*a(n-20) -634*a(n-21) +11103*a(n-22) -18990*a(n-23) +16085*a(n-24) -8600*a(n-25) +3843*a(n-26) -6236*a(n-27) +16348*a(n-28) -24736*a(n-29) +21996*a(n-30) -11504*a(n-31) +2384*a(n-32) +1920*a(n-33) -2496*a(n-34) +1280*a(n-35) -256*a(n-36) for n>41

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A256897 A255756 A254845 * A257784 A254020 A254894

Adjacent sequences:  A254835 A254836 A254837 * A254839 A254840 A254841

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 08 2015

STATUS

approved

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Last modified August 13 14:01 EDT 2022. Contains 356091 sequences. (Running on oeis4.)