A233944 Number of (n+1)X(3+1) 0..2 arrays with every 2X2 subblock having the sum of the absolute values of the edge differences equal to 4

1150, 19484, 328508, 5601514, 95457842, 1628628304, 27781166008, 473979079512, 8086137608310, 137956079585788, 2353599624978228, 40154007613944408, 685051045034336864, 11687408029675999666, 199394347157350034134

Offset

1,1

Comments

Column 3 of A233949

Links

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

Formula

Empirical: a(n) = 22*a(n-1) +20*a(n-2) -2402*a(n-3) +8315*a(n-4) +57619*a(n-5) -297894*a(n-6) -394397*a(n-7) +3586512*a(n-8) -630788*a(n-9) -18290282*a(n-10) +13131067*a(n-11) +44278092*a(n-12) -40653252*a(n-13) -53889205*a(n-14) +50657365*a(n-15) +32681066*a(n-16) -27199613*a(n-17) -9122229*a(n-18) +6034975*a(n-19) +846023*a(n-20) -477739*a(n-21) -19115*a(n-22) +11259*a(n-23) -26*a(n-24) -40*a(n-25)

Example

Some solutions for n=2
..0..2..0..0....1..2..1..0....0..2..0..1....2..0..0..0....0..2..2..0
..1..2..2..2....0..1..0..1....1..2..0..2....2..1..2..0....0..0..2..2
..0..0..0..1....0..2..2..2....1..0..0..0....1..0..2..0....2..1..2..0

Crossrefs

Sequence in context: A074255 A234684 A270513 * A329520 A054999 A086259

Adjacent sequences: A233941 A233942 A233943 * A233945 A233946 A233947

Keyword

nonn

Author

R. H. Hardin, Dec 18 2013

Status

approved