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A199651 Number of nX4 0..2 arrays with values 0..2 introduced in row major order and each element equal to no more than two horizontal and vertical neighbors 1
14, 953, 59212, 3695683, 230693158, 14399942873, 898852775335, 56106912155198, 3502225890582058, 218610965399514236, 13645822881807986686, 851780155556891684028, 53168609887984551128913, 3318815376219262701965237 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A199655

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..200

FORMULA

Empirical: a(n) = 60*a(n-1) +157*a(n-2) -186*a(n-3) -11412*a(n-4) -1614*a(n-5) +148235*a(n-6) -464921*a(n-7) -2730456*a(n-8) +11303105*a(n-9) +29242473*a(n-10) -103029710*a(n-11) -216889526*a(n-12) +436759588*a(n-13) +1010594719*a(n-14) -529467638*a(n-15) -1980627795*a(n-16) -809314204*a(n-17) -566374358*a(n-18) +1148311243*a(n-19) +1261859278*a(n-20) +753254801*a(n-21) -240681242*a(n-22) -120679796*a(n-23) -174398008*a(n-24) -109877696*a(n-25) -6812544*a(n-26) +7732736*a(n-27) +5814784*a(n-28) +1263616*a(n-29) +155648*a(n-30) +98304*a(n-31) for n>32

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A115458 A241801 A337576 * A241110 A055152 A171183

Adjacent sequences:  A199648 A199649 A199650 * A199652 A199653 A199654

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 08 2011

STATUS

approved

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Last modified May 9 04:17 EDT 2021. Contains 343685 sequences. (Running on oeis4.)