A251322 Number of (n+1)X(4+1) 0..1 arrays with every 2X2 subblock having one or two 1s

220, 1982, 17216, 157312, 1405454, 12770802, 114913804, 1040818716, 9388632290, 84916233072, 766719557970, 6930512776886, 62601134362556, 565720424690948, 5110812449111474, 46181028008719378, 417235865422683956

Offset

1,1

Comments

Column 4 of A251326

Links

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

Formula

Empirical: a(n) = 6*a(n-1) +67*a(n-2) -299*a(n-3) -1066*a(n-4) +4715*a(n-5) +3684*a(n-6) -22554*a(n-7) -2351*a(n-8) +42798*a(n-9) -2598*a(n-10) -36276*a(n-11) +3532*a(n-12) +14102*a(n-13) -1392*a(n-14) -2361*a(n-15) +222*a(n-16) +145*a(n-17) -11*a(n-18) -2*a(n-19)

Example

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

Crossrefs

Sequence in context: A241615 A180219 A233626 * A257353 A211820 A215491

Adjacent sequences: A251319 A251320 A251321 * A251323 A251324 A251325

Keyword

nonn

Author

R. H. Hardin, Dec 01 2014

Status

approved