A237844 Number of (n+1)X(2+1) 0..2 arrays with the maximum minus the lower median of every 2X2 subblock equal

369, 3419, 31661, 320263, 3281101, 34361837, 361511653, 3828421599, 40604391821, 431555364477, 4589018827607, 48831649213027, 519706227658945, 5532396609847103, 58897181963791815, 627059394003987035

Offset

1,1

Comments

Column 2 of A237850

Links

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

Formula

Empirical: a(n) = 19*a(n-1) -26*a(n-2) -1354*a(n-3) +6471*a(n-4) +28813*a(n-5) -231046*a(n-6) -109423*a(n-7) +3526315*a(n-8) -3576784*a(n-9) -26974056*a(n-10) +52871335*a(n-11) +103996087*a(n-12) -324210864*a(n-13) -147836704*a(n-14) +1068205642*a(n-15) -281417288*a(n-16) -1965277664*a(n-17) +1461313160*a(n-18) +1869996168*a(n-19) -2374039488*a(n-20) -570178496*a(n-21) +1797323328*a(n-22) -380875136*a(n-23) -564139008*a(n-24) +295181312*a(n-25) +22262784*a(n-26) -45019136*a(n-27) +9666560*a(n-28) -491520*a(n-29)

Example

Some solutions for n=3
..0..1..2....0..1..0....0..1..2....0..2..2....1..1..0....2..0..2....0..1..0
..0..1..2....1..2..1....0..1..2....1..0..0....2..2..2....2..1..1....2..1..0
..1..2..1....1..2..1....2..1..2....0..2..0....0..1..0....1..1..2....0..1..2
..1..1..0....2..1..2....1..2..0....0..0..1....0..1..0....2..1..0....2..1..2

Crossrefs

Sequence in context: A275170 A205911 A205903 * A255202 A255194 A108772

Adjacent sequences: A237841 A237842 A237843 * A237845 A237846 A237847

Keyword

nonn

Author

R. H. Hardin, Feb 14 2014

Status

approved