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A251330 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock summing to 2 4 or 6 1
753, 7393, 75391, 801579, 8863633, 101497397, 1196729319, 14442382927, 177420001949, 2208479081653, 27755064033131, 351209824628763, 4465808638298741, 56979652386854697, 728758207069222935 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A251335

LINKS

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

FORMULA

Empirical: a(n) = 49*a(n-1) -940*a(n-2) +8509*a(n-3) -30084*a(n-4) -47347*a(n-5) +500152*a(n-6) +81043*a(n-7) -3272883*a(n-8) -3063686*a(n-9) +3924236*a(n-10) +5794584*a(n-11) +519392*a(n-12) -1443456*a(n-13) -207360*a(n-14) +110592*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A223447 A200211 A177423 * A092449 A197107 A274235

Adjacent sequences:  A251327 A251328 A251329 * A251331 A251332 A251333

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 01 2014

STATUS

approved

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Last modified November 22 05:55 EST 2019. Contains 329388 sequences. (Running on oeis4.)