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A236822 Number of (n+1)X(2+1) 0..2 arrays with the maximum plus the minimum minus the lower median of every 2X2 subblock equal 1
327, 2211, 15254, 109205, 786609, 5747502, 42215123, 312592339, 2324534826, 17376767995, 130331607713, 981030661960, 7403192678283, 56006537652545, 424502700379214, 3223178794593881, 24506960972636245, 186565676015487922 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A236828

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -74*a(n-2) -950*a(n-3) +7675*a(n-4) +5902*a(n-5) -208583*a(n-6) +358712*a(n-7) +2437168*a(n-8) -8245218*a(n-9) -11507689*a(n-10) +77981588*a(n-11) -13353740*a(n-12) -390127858*a(n-13) +398463912*a(n-14) +1060576100*a(n-15) -1911844548*a(n-16) -1338399672*a(n-17) +4592202520*a(n-18) -205399632*a(n-19) -6115028512*a(n-20) +2874814400*a(n-21) +4321062784*a(n-22) -3582260416*a(n-23) -1253904064*a(n-24) +1886965760*a(n-25) -92450688*a(n-26) -394737408*a(n-27) +90316800*a(n-28) +17190912*a(n-29) -4915200*a(n-30)

EXAMPLE

Some solutions for n=4

..0..1..2....1..2..0....2..0..0....2..1..0....2..1..0....2..1..0....2..0..1

..1..0..1....1..2..0....2..1..1....0..2..2....2..2..1....1..0..1....2..1..2

..1..0..1....0..0..0....2..2..0....1..2..1....0..1..0....1..2..2....0..2..0

..0..0..0....1..2..1....0..1..2....0..1..0....1..0..1....2..0..1....1..2..1

..0..1..1....2..1..2....0..0..2....2..2..2....2..2..1....1..2..2....2..0..1

CROSSREFS

Sequence in context: A158271 A203723 A097737 * A126311 A097738 A239536

Adjacent sequences: A236819 A236820 A236821 * A236823 A236824 A236825

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 31 2014

STATUS

approved

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Last modified December 5 21:40 EST 2022. Contains 358594 sequences. (Running on oeis4.)