A233070 Number of nX5 0..3 arrays with no element x(i,j) adjacent to value 3-x(i,j) horizontally, antidiagonally or vertically, top left element zero, and 1 appearing before 2 in row major order

41, 1682, 80811, 3957778, 194998895, 9622519979, 475027244071, 23452561697310, 1157902539075279, 57168401542703366, 2822543431496611477, 139355894459526629065, 6880342889895213536639, 339699437967530482926608

Offset

1,1

Comments

Column 5 of A233073

Links

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

Formula

Empirical: a(n) = 67*a(n-1) -957*a(n-2) +4487*a(n-3) -10440*a(n-4) +9842*a(n-5) +34671*a(n-6) -145789*a(n-7) +111684*a(n-8) +296032*a(n-9) -481473*a(n-10) -167907*a(n-11) +608240*a(n-12) -12730*a(n-13) -416027*a(n-14) +59065*a(n-15) +178117*a(n-16) -40627*a(n-17) -41054*a(n-18) +13432*a(n-19) +2184*a(n-20) -816*a(n-21) for n>23

Example

Some solutions for n=3
..0..0..1..1..0....0..1..1..3..3....0..1..0..1..1....0..0..0..1..0
..1..1..3..1..0....0..1..1..1..3....1..1..1..1..3....0..0..0..0..1
..1..1..3..1..0....1..3..3..1..3....0..1..1..1..1....0..0..1..1..3

Crossrefs

Sequence in context: A218743 A009985 A147521 * A267267 A049676 A275501

Adjacent sequences: A233067 A233068 A233069 * A233071 A233072 A233073

Keyword

nonn

Author

R. H. Hardin, Dec 03 2013

Status

approved