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A259520 Number of (n+1)X(4+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0001 0011 0101 or 1111 1
380, 6100, 93028, 1447270, 22453286, 348802846, 5417785744, 84159480298, 1307320968014, 20307866257912, 315461519753608, 4900368198470600, 76122150981402540, 1182478924960407640, 18368587834267497600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A259524

LINKS

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

FORMULA

Empirical: a(n) = 25*a(n-1) -152*a(n-2) -109*a(n-3) +3368*a(n-4) -6811*a(n-5) -12971*a(n-6) +49951*a(n-7) -9491*a(n-8) -92048*a(n-9) +49214*a(n-10) +74086*a(n-11) -38089*a(n-12) -32429*a(n-13) +8846*a(n-14) +6910*a(n-15) -139*a(n-16) -458*a(n-17) -58*a(n-18) -2*a(n-19)

EXAMPLE

Some solutions for n=3

..1..0..0..1..1....0..0..0..0..0....1..0..0..0..1....0..0..0..0..1

..0..0..1..0..0....1..0..0..0..1....0..0..1..0..0....0..1..1..1..0

..0..0..0..0..0....0..1..1..0..0....0..0..1..0..0....1..0..0..0..0

..1..1..1..0..1....1..0..0..0..1....1..0..1..0..0....0..1..1..0..0

CROSSREFS

Cf. A259524

Sequence in context: A252122 A250635 A233952 * A188307 A214145 A185493

Adjacent sequences:  A259517 A259518 A259519 * A259521 A259522 A259523

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 29 2015

STATUS

approved

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Last modified January 23 10:03 EST 2022. Contains 350510 sequences. (Running on oeis4.)