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A252860 Number of (n+2)X(7+2) 0..2 arrays with every consecutive three elements in every row, column, diagonal and antidiagonal having exactly two distinct values, and new values 0 upwards introduced in row major order 1
29241, 9936, 12762, 26766, 58644, 126306, 275598, 596250, 1300068, 2826126, 6150222, 13372920, 29103120, 63319122, 137750292, 299686752, 652050702, 1418684886, 3086460666, 6715111032, 14610041622, 31786923600, 69157031958 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A252861

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +4*a(n-2) -2*a(n-3) +4*a(n-4) -4*a(n-5) -29*a(n-6) +5*a(n-7) +4*a(n-8) +75*a(n-10) +79*a(n-11) -11*a(n-12) -163*a(n-13) -167*a(n-14) +3*a(n-15) +123*a(n-16) +135*a(n-17) +58*a(n-18) +4*a(n-19) -32*a(n-20) -39*a(n-21) -84*a(n-22) -61*a(n-23) +26*a(n-24) +47*a(n-25) +62*a(n-26) -3*a(n-27) -17*a(n-28) -21*a(n-29) -4*a(n-30) +6*a(n-31) +a(n-32) +2*a(n-33) -a(n-34) for n>36

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Sequence in context: A242741 A152939 A028462 * A206470 A194619 A058652

Adjacent sequences:  A252857 A252858 A252859 * A252861 A252862 A252863

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 23 2014

STATUS

approved

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Last modified May 9 10:29 EDT 2021. Contains 343732 sequences. (Running on oeis4.)