A209549 - OEIS

A209549

1/4 the number of (n+1)X5 0..3 arrays with every 2X2 subblock having exactly two distinct clockwise edge differences

191, 3051, 46515, 723636, 11226644, 174401424, 2708892873, 42079740150, 653660484008, 10153933128957, 157730759876805, 2450184099235301, 38061075490701271, 591239462480203821, 9184293917133748801

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,1

COMMENTS

Column 4 of A209553

LINKS

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

FORMULA

Empirical: a(n) = 26*a(n-1) -177*a(n-2) +43*a(n-3) +3477*a(n-4) -10179*a(n-5) -6160*a(n-6) +62922*a(n-7) -59442*a(n-8) -82557*a(n-9) +141262*a(n-10) +24872*a(n-11) -112175*a(n-12) +5660*a(n-13) +41275*a(n-14) -1936*a(n-15) -7049*a(n-16) -319*a(n-17) +400*a(n-18) +56*a(n-19) +2*a(n-20)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A264844 A061331 A177683 * A218595 A296580 A206860

Adjacent sequences: A209546 A209547 A209548 * A209550 A209551 A209552

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 10 2012

STATUS

approved