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A236980 Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median plus the lower median of every 2X2 subblock equal 1
256, 888, 3000, 11388, 43096, 171036, 680872, 2770540, 11314280, 46745212, 193702392, 808182812, 3379755176, 14195483212, 59730878232, 252065800108, 1065257795496, 4511108677852, 19125825557240, 81209035684796 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A236987

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -49*a(n-2) -974*a(n-3) +6544*a(n-4) +15552*a(n-5) -239242*a(n-6) +153500*a(n-7) +4593459*a(n-8) -10260182*a(n-9) -52330353*a(n-10) +196342530*a(n-11) +342078502*a(n-12) -2201198668*a(n-13) -754500084*a(n-14) +16383893648*a(n-15) -7843044456*a(n-16) -84185730992*a(n-17) +91336550688*a(n-18) +299169566880*a(n-19) -494453981312*a(n-20) -710291341312*a(n-21) +1690514443008*a(n-22) +1001466854912*a(n-23) -3875588317184*a(n-24) -416161998848*a(n-25) +5974812073984*a(n-26) -1228457795584*a(n-27) -6020740644864*a(n-28) +2548308574208*a(n-29) +3735935254528*a(n-30) -2188695306240*a(n-31) -1288941600768*a(n-32) +933983944704*a(n-33) +210685132800*a(n-34) -187026112512*a(n-35) -11324620800*a(n-36) +13589544960*a(n-37)

EXAMPLE

Some solutions for n=5

..2..0....3..1....1..2....1..2....2..1....0..2....1..3....1..3....1..2....2..0

..0..3....2..1....2..2....0..2....2..2....2..2....3..1....2..3....1..3....2..1

..0..2....1..3....2..1....3..0....0..2....2..0....2..2....0..3....0..2....1..2

..3..0....1..2....0..3....2..0....1..3....2..2....2..3....3..2....3..1....2..1

..1..1....0..3....3..0....1..2....2..1....1..2....2..2....2..3....2..1....1..2

..1..3....1..2....3..0....2..1....3..1....3..0....0..3....3..2....3..1....0..2

CROSSREFS

Sequence in context: A258733 A209381 A236987 * A224975 A237090 A224968

Adjacent sequences:  A236977 A236978 A236979 * A236981 A236982 A236983

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 02 2014

STATUS

approved

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Last modified June 25 03:00 EDT 2022. Contains 354835 sequences. (Running on oeis4.)