A229517 Number of n X 4 0..2 arrays of the median of the corresponding element, the element to the east and the element to the south in a larger (n+1) X 5 0..2 array without adjacent equal elements in the latter.

39, 481, 4193, 34151, 275243, 2223913, 17910863, 144971845, 1169783337, 9467210619, 76463151051, 618555984777, 4998183735285, 40420906533161, 326695769416007, 2641578123513399, 21352776926914139, 172637934108286039

Offset

1,1

Comments

Column 4 of A229521.

Links

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

R. H. Hardin, Empirical recurrence of order 75

Formula

Empirical recurrence of order 75 (see link above).

Example

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

Crossrefs

Cf. A229521.

Sequence in context: A210328 A231993 A357958 * A254871 A193072 A077454

Adjacent sequences: A229514 A229515 A229516 * A229518 A229519 A229520

Keyword

nonn

Author

R. H. Hardin, Sep 25 2013

Status

approved