A232940 Number of nX7 0..2 arrays with no element x(i,j) adjacent to value 2-x(i,j) horizontally, vertically or antidiagonally

192, 554, 7212, 79810, 932576, 10700160, 123516664, 1422959686, 16403819514, 189062126148, 2179181824046, 25117338039572, 289505052484974, 3336861029886146, 38460966820329646, 443304625973863734

Offset

1,1

Comments

Column 7 of A232941

Links

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

Formula

Empirical: a(n) = a(n-1) +85*a(n-2) +432*a(n-3) +192*a(n-4) -3711*a(n-5) -5096*a(n-6) +21164*a(n-7) +27340*a(n-8) -112654*a(n-9) -37244*a(n-10) +477721*a(n-11) -464722*a(n-12) -897815*a(n-13) +3102284*a(n-14) -4149918*a(n-15) +2761082*a(n-16) -138325*a(n-17) -1353257*a(n-18) +942033*a(n-19) +64683*a(n-20) -365483*a(n-21) +80904*a(n-22) +92350*a(n-23) -27097*a(n-24) -23292*a(n-25) +2585*a(n-26) +5635*a(n-27) +1405*a(n-28) -561*a(n-29) -545*a(n-30) -173*a(n-31) -14*a(n-32) +5*a(n-33) +a(n-34) for n>35

Example

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

Crossrefs

Sequence in context: A030632 A189987 A229361 * A254854 A254847 A251083

Adjacent sequences: A232937 A232938 A232939 * A232941 A232942 A232943

Keyword

nonn

Author

R. H. Hardin, Dec 02 2013

Status

approved