A253616 Number of (1+2)X(n+2) 0..2 arrays with every consecutive three elements in every row and diagonal having one or two distinct values, and in every column and antidiagonal having two or three distinct values, and new values 0 upwards introduced in row major order

762, 6916, 61634, 551335, 4928315, 44053769, 393764260, 3519639788, 31459908182, 281200614035, 2513478876664, 22466435080916, 200813587498508, 1794948674702772, 16043937986692632, 143406856340911936

Offset

1,1

Comments

Row 1 of A253615

Links

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

R. H. Hardin, Empirical recurrence of order 80

Formula

Empirical recurrence of order 80 (see link above)

Example

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

Crossrefs

Sequence in context: A083644 A061225 A253615 * A253611 A326369 A210081

Adjacent sequences: A253613 A253614 A253615 * A253617 A253618 A253619

Keyword

nonn

Author

R. H. Hardin, Jan 05 2015

Status

approved