A237070 Number of (n+1)X(2+1) 0..3 arrays with the upper median of every 2X2 subblock equal

2132, 51000, 1046822, 23830240, 540277188, 12551185804, 294492604648, 6989324869096, 167232420014498, 4029067621055448, 97592972252737200, 2374102520064628500, 57949191834429405188, 1418253916366402813864

Offset

1,1

Comments

Column 2 of A237076

Links

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

Formula

Empirical: a(n) = 50*a(n-1) -305*a(n-2) -17742*a(n-3) +204833*a(n-4) +2409450*a(n-5) -34681206*a(n-6) -149093728*a(n-7) +2823190637*a(n-8) +3441629610*a(n-9) -127332846181*a(n-10) +56979763614*a(n-11) +3341227459795*a(n-12) -4939345866790*a(n-13) -51735505359284*a(n-14) +115083242035280*a(n-15) +461866266956256*a(n-16) -1354272008080992*a(n-17) -2155667861267200*a(n-18) +8663472669351168*a(n-19) +3465282805447680*a(n-20) -29040718122731520*a(n-21) +7216113174921216*a(n-22) +44921535152652288*a(n-23) -27509147506114560*a(n-24) -21567985066967040*a(n-25) +16606422836969472*a(n-26)

Example

Some solutions for n=2
..0..0..3....0..1..3....2..0..2....1..2..0....2..2..2....3..1..2....2..0..0
..3..3..3....2..2..0....3..2..3....0..1..1....2..0..2....0..3..3....1..1..1
..3..2..1....2..2..3....2..1..2....1..0..1....3..2..1....2..3..0....1..0..2

Crossrefs

Sequence in context: A066817 A110024 A260068 * A157768 A067199 A064249

Adjacent sequences: A237067 A237068 A237069 * A237071 A237072 A237073

Keyword

nonn

Author

R. H. Hardin, Feb 03 2014

Status

approved