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A275039 Number of 4Xn 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-2) or (-2,0) and new values introduced in order 0..2. 1
6, 54, 146, 570, 2185, 8273, 31495, 120845, 462819, 1770014, 6774047, 25932054, 99241078, 379774913, 1453487054, 5562892365, 21289984945, 81479806330, 311837664172, 1193456060092, 4567548672431, 17480762283012, 66901812670647 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A275037.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -9*a(n-2) +19*a(n-3) -9*a(n-4) -9*a(n-5) +87*a(n-6) -46*a(n-7) -84*a(n-8) +7*a(n-9) -59*a(n-10) -45*a(n-11) +31*a(n-12) +23*a(n-13) +4*a(n-14) -a(n-15) -a(n-16) +a(n-17) for n>19

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A275037.

Sequence in context: A153333 A284858 A343982 * A195901 A260955 A072368

Adjacent sequences:  A275036 A275037 A275038 * A275040 A275041 A275042

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 14 2016

STATUS

approved

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Last modified January 19 05:41 EST 2022. Contains 350464 sequences. (Running on oeis4.)