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A206006 Number of (n+1)X5 0..2 arrays with the number of clockwise edge increases in every 2X2 subblock equal to one, and every 2X2 determinant nonzero 1
722, 3706, 12068, 64224, 211824, 1159120, 3850160, 21563332, 71908620, 410324398, 1371057344, 7935278938, 26539793884, 155196079882, 519275349560, 3058687618974, 10235947682204, 60595706198366, 202797923521632 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A206010

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +42*a(n-2) -482*a(n-3) -293*a(n-4) +11440*a(n-5) -11229*a(n-6) -137742*a(n-7) +261810*a(n-8) +894760*a(n-9) -2462973*a(n-10) -2981208*a(n-11) +12607691*a(n-12) +3180168*a(n-13) -38516874*a(n-14) +11294550*a(n-15) +72866395*a(n-16) -51223616*a(n-17) -84265347*a(n-18) +98230578*a(n-19) +50978982*a(n-20) -112745308*a(n-21) +3184853*a(n-22) +82656280*a(n-23) -34966370*a(n-24) -37445012*a(n-25) +32301744*a(n-26) +8331808*a(n-27) -15845182*a(n-28) +649616*a(n-29) +4536888*a(n-30) -914656*a(n-31) -719464*a(n-32) +226432*a(n-33) +51024*a(n-34) -24320*a(n-35) -128*a(n-36) +1024*a(n-37) -128*a(n-38) for n>40

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A260498 A259721 A133531 * A231485 A035756 A107552

Adjacent sequences:  A206003 A206004 A206005 * A206007 A206008 A206009

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 02 2012

STATUS

approved

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Last modified October 25 21:15 EDT 2021. Contains 348256 sequences. (Running on oeis4.)