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A262315 Number of (n+2)X(3+2) 0..1 arrays with each row and column divisible by 7, read as a binary number with top and left being the most significant bits. 1
5, 9, 17, 133, 361, 1009, 8357, 33993, 127121, 795013, 3876585, 16907121, 90644645, 463649609, 2179845009, 11046180229, 56646588009, 276046895345, 1376462436005, 7003379302345, 34679915634321, 172507268999557, 871215356444137 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A262319.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +203*a(n-3) -1015*a(n-4) -17262*a(n-6) +86310*a(n-7) +803306*a(n-9) -4016530*a(n-10) -22920723*a(n-12) +114603615*a(n-13) +424713065*a(n-15) -2123565325*a(n-16) -5289109868*a(n-18) +26445549340*a(n-19) +45727616604*a(n-21) -228638083020*a(n-22) -289788580823*a(n-24) +1448942904115*a(n-25) +1453125527917*a(n-27) -7265627639585*a(n-28) -5836364956590*a(n-30) +29181824782950*a(n-31) +16212555187738*a(n-33) -81062775938690*a(n-34) -21276199455861*a(n-36) +106380997279305*a(n-37) -6355957095425*a(n-39) +31779785477125*a(n-40) +38763541794536*a(n-42) -193817708972680*a(n-43)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A262319.

Sequence in context: A262484 A228956 A233584 * A315119 A061502 A110349

Adjacent sequences:  A262312 A262313 A262314 * A262316 A262317 A262318

KEYWORD

nonn

AUTHOR

R. H. Hardin, Sep 17 2015

STATUS

approved

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Last modified September 22 10:29 EDT 2021. Contains 347606 sequences. (Running on oeis4.)