A275270 Number of 6Xn 0..2 arrays with no element equal to any value at offset (-2,-1) (-2,1) or (-1,-1) and new values introduced in order 0..2.

122, 476, 5676, 73012, 1020324, 14005180, 194398028, 2686400148, 37200327664, 514676494036, 7123566240956, 98578693085116, 1364279138577040, 18880263421570580, 261288143644476120, 3615999105798657888

Offset

1,1

Comments

Row 6 of A275266.

Links

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

Formula

Empirical: a(n) = 15*a(n-1) +3*a(n-2) -370*a(n-3) +1735*a(n-4) -3994*a(n-5) +4671*a(n-6) -5557*a(n-7) +17662*a(n-8) -35794*a(n-9) -70438*a(n-10) +88858*a(n-11) +82464*a(n-12) +406924*a(n-13) +235375*a(n-14) +163182*a(n-15) -71035*a(n-16) -197836*a(n-17) -137928*a(n-18) -51312*a(n-19) +39632*a(n-20) +35968*a(n-21) +19456*a(n-22) -6144*a(n-23) -4096*a(n-24) for n>26

Example

Some solutions for n=4
..0..1..0..1. .0..1..1..2. .0..1..0..2. .0..1..0..1. .0..1..0..1
..2..1..2..1. .0..2..0..2. .0..1..0..1. .0..1..2..1. .0..2..0..2
..2..1..2..1. .0..2..0..2. .2..1..0..2. .0..1..0..1. .2..1..0..2
..2..1..2..1. .1..2..1..2. .2..1..0..2. .0..1..2..1. .0..1..0..1
..2..0..0..1. .1..2..1..2. .0..1..0..1. .0..2..2..1. .2..1..0..2
..0..0..2..1. .1..0..1..0. .2..1..0..1. .0..1..0..1. .2..1..2..2

Crossrefs

Cf. A275266.

Sequence in context: A195856 A116216 A203805 * A031700 A173267 A229722

Adjacent sequences: A275267 A275268 A275269 * A275271 A275272 A275273

Keyword

nonn

Author

R. H. Hardin, Jul 21 2016

Status

approved