A204956 Number of (n+1)X3 0..1 arrays with rows and columns of permanents of all 2X2 subblocks lexicographically nondecreasing

51, 277, 1436, 6921, 32468, 147434, 659392, 2907273, 12720102, 55312482, 239664411, 1035761616, 4469289143, 19264431459, 82983495781, 357308047528, 1538085137733, 6619812032809, 28488295966068, 122591240597807

Offset

1,1

Comments

Column 2 of A204962

Links

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

Formula

Empirical: a(n) = 7*a(n-1) +6*a(n-2) -121*a(n-3) +60*a(n-4) +899*a(n-5) -794*a(n-6) -3741*a(n-7) +3822*a(n-8) +9513*a(n-9) -10198*a(n-10) -15151*a(n-11) +16736*a(n-12) +14873*a(n-13) -17358*a(n-14) -8327*a(n-15) +11131*a(n-16) +1988*a(n-17) -4040*a(n-18) +204*a(n-19) +636*a(n-20) -144*a(n-21)

Example

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

Crossrefs

Sequence in context: A193250 A204717 A253921 * A243462 A251351 A251344

Adjacent sequences: A204953 A204954 A204955 * A204957 A204958 A204959

Keyword

nonn

Author

R. H. Hardin Jan 20 2012

Status

approved