A305179 Number of nX5 0..1 arrays with every element unequal to 1, 2, 5, 6 or 7 king-move adjacent elements, with upper left element zero.

3, 8, 14, 13, 64, 137, 140, 668, 1652, 2361, 6578, 18378, 34712, 74220, 198302, 443314, 914478, 2205546, 5256982, 11329144, 25638940, 60932298, 137160172, 305545804, 709266522, 1629634600, 3657579692, 8345325220, 19216257540, 43592320618

Offset

1,1

Comments

Column 5 of A305182.

Links

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

Formula

Empirical: a(n) = 2*a(n-2) +17*a(n-3) +9*a(n-4) -31*a(n-5) -131*a(n-6) -91*a(n-7) +206*a(n-8) +575*a(n-9) +361*a(n-10) -762*a(n-11) -1527*a(n-12) -664*a(n-13) +1679*a(n-14) +2438*a(n-15) +360*a(n-16) -2241*a(n-17) -1976*a(n-18) +713*a(n-19) +1609*a(n-20) -67*a(n-21) -1372*a(n-22) -101*a(n-23) +1502*a(n-24) +741*a(n-25) -640*a(n-26) -994*a(n-27) +152*a(n-28) +351*a(n-29) +44*a(n-30) -386*a(n-31) -78*a(n-32) +338*a(n-33) +196*a(n-34) -6*a(n-35) -204*a(n-36) -74*a(n-37) +20*a(n-38) +52*a(n-39) +18*a(n-40) -4*a(n-41) -16*a(n-42) +4*a(n-43) for n>50

Example

Some solutions for n=5
..0..1..0..1..0. .0..1..1..1..1. .0..1..1..0..1. .0..1..0..1..0
..0..0..0..0..0. .1..0..1..1..0. .1..0..1..1..1. .0..0..0..0..0
..0..0..0..0..0. .1..1..1..1..1. .1..1..1..1..1. .0..0..0..0..0
..0..1..1..0..1. .1..1..1..1..0. .1..1..1..0..1. .0..1..0..1..0
..0..0..0..0..0. .1..0..1..1..1. .1..0..1..1..0. .1..0..0..0..1

Crossrefs

Cf. A305182.

Sequence in context: A153891 A056402 A366071 * A106386 A000232 A375292

Adjacent sequences: A305176 A305177 A305178 * A305180 A305181 A305182

Keyword

nonn

Author

R. H. Hardin, May 26 2018

Status

approved