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A280603 Number of nX7 0..1 arrays with no element equal to more than two of its horizontal, vertical and antidiagonal neighbors and with new values introduced in order 0 sequentially upwards. 1
64, 1063, 1844, 3996, 8031, 15792, 31152, 62349, 126893, 261994, 546766, 1149413, 2427843, 5143554, 10917253, 23198800, 49332659, 104956473, 223368832, 475481120, 1012314087, 2155517167, 4590184433, 9775585448, 20820112373 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A280604.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) -8*a(n-2) +4*a(n-3) +2*a(n-8) -2*a(n-9) -3*a(n-10) +5*a(n-11) -a(n-12) -a(n-13) -a(n-16) +a(n-17) for n>22

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A280604.

Sequence in context: A231952 A223018 A221247 * A301322 A300497 A300936

Adjacent sequences: A280600 A280601 A280602 * A280604 A280605 A280606

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 06 2017

STATUS

approved

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Last modified December 1 21:09 EST 2022. Contains 358484 sequences. (Running on oeis4.)