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A235768 Number of (n+1)X(3+1) 0..1 arrays with the sum of each 2X2 subblock two extreme terms minus its two median terms lexicographically nondecreasing columnwise and nonincreasing rowwise 1
120, 628, 2994, 12417, 47501, 166904, 552444, 1724793, 5144350, 14696712, 40503441, 107993795, 279771656, 706134649, 1741178487, 4204576953, 9961571579, 23204492256, 53213406141, 120352868718, 268716844980, 593201019964 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235772

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +22*a(n-2) -106*a(n-3) -206*a(n-4) +1310*a(n-5) +970*a(n-6) -10018*a(n-7) -1220*a(n-8) +53030*a(n-9) -14210*a(n-10) -205870*a(n-11) +113050*a(n-12) +605570*a(n-13) -469970*a(n-14) -1374070*a(n-15) +1346965*a(n-16) +2422430*a(n-17) -2874380*a(n-18) -3308560*a(n-19) +4711492*a(n-20) +3445592*a(n-21) -6005504*a(n-22) -2628928*a(n-23) +5959072*a(n-24) +1319360*a(n-25) -4565120*a(n-26) -254464*a(n-27) +2650240*a(n-28) -198400*a(n-29) -1127936*a(n-30) +203264*a(n-31) +332032*a(n-32) -88576*a(n-33) -60416*a(n-34) +20480*a(n-35) +5120*a(n-36) -2048*a(n-37)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A090216 A265041 A280425 * A179963 A229568 A292365

Adjacent sequences:  A235765 A235766 A235767 * A235769 A235770 A235771

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 15 2014

STATUS

approved

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Last modified March 30 12:10 EDT 2020. Contains 333125 sequences. (Running on oeis4.)