A259248 Number of (n+1)X(6+1) 0..1 arrays with each 2X2 subblock having clockwise pattern 0000 0011 or 0111

588, 5216, 41552, 361728, 2964676, 25462352, 211569948, 1802996568, 15090948960, 128059095616, 1076133958644, 9111215773728, 76735453511764, 648920372600856, 5472076754002096, 46246969544401512, 390256929158755132

Offset

1,1

Comments

Column 6 of A259250

Links

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

Formula

Empirical: a(n) = 18*a(n-1) +4*a(n-2) -1673*a(n-3) +5523*a(n-4) +59794*a(n-5) -285439*a(n-6) -1125159*a(n-7) +6632986*a(n-8) +12721025*a(n-9) -87684501*a(n-10) -94080286*a(n-11) +710791611*a(n-12) +488130615*a(n-13) -3604094066*a(n-14) -1833458263*a(n-15) +11326266573*a(n-16) +4724718346*a(n-17) -21581019805*a(n-18) -7446002885*a(n-19) +24486208594*a(n-20) +6596083231*a(n-21) -16015478187*a(n-22) -3007670078*a(n-23) +5645651298*a(n-24) +594934259*a(n-25) -947418958*a(n-26) -24710432*a(n-27) +60791760*a(n-28) -1899504*a(n-29) -988000*a(n-30) +58880*a(n-31)

Example

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

Crossrefs

Cf. A259250

Sequence in context: A230716 A211852 A178973 * A238519 A185884 A115487

Adjacent sequences: A259245 A259246 A259247 * A259249 A259250 A259251

Keyword

nonn

Author

R. H. Hardin, Jun 22 2015

Status

approved