A260977 Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000001 00001001 or 00100101

1146, 925, 1288, 2714, 4592, 9144, 14672, 29768, 50432, 101372, 171124, 340878, 582500, 1157798, 1990592, 3921926, 6784120, 13315792, 23162244, 45162484, 78973048, 153447472, 269491716, 520685028, 918595544, 1769858760, 3133573780

Offset

1,1

Comments

Column 5 of A260980

Links

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

Formula

Empirical: a(n) = 12*a(n-4) +4*a(n-5) +4*a(n-7) -15*a(n-8) -32*a(n-9) -3*a(n-10) -34*a(n-11) +a(n-12) +16*a(n-13) +8*a(n-14) +28*a(n-15) -51*a(n-16) +40*a(n-17) +16*a(n-18) -36*a(n-19) +33*a(n-20) +224*a(n-21) -4*a(n-23) +64*a(n-24) +128*a(n-25) -24*a(n-27) +64*a(n-28) for n>34

Example

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

Crossrefs

Cf. A260980

Sequence in context: A237458 A202312 A123697 * A227478 A190924 A196779

Adjacent sequences: A260974 A260975 A260976 * A260978 A260979 A260980

Keyword

nonn

Author

R. H. Hardin, Aug 06 2015

Status

approved