A232925 Number of 6Xn 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, diagonally or antidiagonally

729, 1458, 23346, 235824, 2986152, 33994188, 409408542, 4791504648, 56948232390, 671408641884, 7950212281224, 93923210426688, 1110971521842576, 13132515793768920, 155290791915166218, 1835954950424998884

Offset

1,1

Comments

Row 6 of A232920

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +109*a(n-2) -256*a(n-3) -3152*a(n-4) +4016*a(n-5) +36307*a(n-6) -39164*a(n-7) -200969*a(n-8) +225166*a(n-9) +558858*a(n-10) -666143*a(n-11) -821349*a(n-12) +1028812*a(n-13) +665423*a(n-14) -859266*a(n-15) -301764*a(n-16) +388624*a(n-17) +75683*a(n-18) -91245*a(n-19) -9839*a(n-20) +10158*a(n-21) +486*a(n-22) -420*a(n-23) for n>24

Example

Some solutions for n=4
..0..0..1..0....0..1..2..2....0..0..0..1....0..0..0..0....0..1..2..1
..0..0..1..0....2..1..2..1....0..1..0..0....0..0..0..0....2..1..2..2
..0..0..0..0....2..2..2..2....2..1..0..0....1..0..0..0....2..2..2..2
..1..0..1..0....2..2..2..2....0..1..0..1....1..0..0..1....1..2..1..2
..1..0..1..2....2..2..1..2....0..1..0..1....1..0..0..1....1..2..1..2
..1..0..1..0....1..2..1..0....0..0..0..1....1..0..0..0....1..0..1..0

Crossrefs

Sequence in context: A119710 A043455 A267697 * A255112 A255627 A139308

Adjacent sequences: A232922 A232923 A232924 * A232926 A232927 A232928

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved