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A212476 Number of 0..3 arrays of length 2*n+4 with sum no more than 3*n in any length 2n subsequence (=50% duty cycle) 1
707, 16649, 321320, 5622580, 95010466, 1578372444, 25966120647, 424537002094, 6911873593516, 112193588288892, 1817051683302947, 29377851622547612, 474335448720482746, 7650319463541214660, 123278749437509026298 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 5 of A212471

LINKS

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

EXAMPLE

Some solutions for n=3

..2....0....2....2....0....0....0....0....2....0....2....2....0....2....0....0

..0....2....0....2....2....2....0....2....0....0....0....2....0....2....0....2

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

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

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

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

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

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

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

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

CROSSREFS

Sequence in context: A183795 A252692 A074869 * A188098 A306365 A279747

Adjacent sequences:  A212473 A212474 A212475 * A212477 A212478 A212479

KEYWORD

nonn

AUTHOR

R. H. Hardin May 17 2012

STATUS

approved

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Last modified July 20 01:17 EDT 2019. Contains 325168 sequences. (Running on oeis4.)