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A069294 Number of n X 3 binary arrays with a path of adjacent 1's from upper left corner to anywhere in right hand column. 26
12, 110, 926, 7556, 60920, 488860, 3915640, 31340216, 250769592, 2006308480, 16050948896, 128409116176, 1027277763840, 8218237436320, 65745948074080, 525967738606656, 4207742397091072, 33661940724484800, 269295530702399616 (list; graph; refs; listen; history; text; internal format)
OFFSET

2,1

LINKS

Table of n, a(n) for n=2..20.

Index entries for linear recurrences with constant coefficients, signature (12,-34,14,16).

FORMULA

G.f.: 2*x^2*(6-17*x+7*x^2+8*x^3)/(1-8*x)/(2*x^3+2*x^2-4*x+1). - Vladeta Jovovic, Jul 02 2003

PROG

(PARI) a(n)=([0, 1, 0, 0; 0, 0, 1, 0; 0, 0, 0, 1; 16, 14, -34, 12]^(n-2)*[12; 110; 926; 7556])[1, 1] \\ Charles R Greathouse IV, May 10 2016

CROSSREFS

Cf. n X 2 A002450, n X 4 A069295, n X 5 A069296, n X 6 A069297, n X 7 A069298, n X 8 A069299, n X 9 A069300, n X 10 A069301, n X 11 A069302, n X 12 A069303, n X 13 A069304, n X 14 A069305, read by rows A069306-A069320.

Sequence in context: A037581 A177071 A081183 * A000559 A037714 A037616

Adjacent sequences:  A069291 A069292 A069293 * A069295 A069296 A069297

KEYWORD

nonn,easy

AUTHOR

R. H. Hardin, Mar 14 2002

STATUS

approved

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Last modified August 20 03:34 EDT 2017. Contains 290823 sequences.