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A268161 Number of 4Xn arrays containing n copies of 0..4-1 with every element equal to at least one vertical or antidiagonal neighbor and the top left element equal to 0. 1
0, 6, 36, 906, 31818, 770406, 28194516, 857204082, 29334686760, 981701367120, 33610273278060, 1163386717573176, 40538287466544630, 1426710530475496692, 50491865673413814126, 1798794705043994212440, 64408154737694955274872 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A268159.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..20

EXAMPLE

Some solutions for n=4

..0..1..0..2....0..1..0..3....0..2..3..1....0..0..1..3....0..3..2..0

..0..1..0..2....0..1..0..3....0..2..3..1....0..0..1..3....0..3..2..0

..1..3..3..2....1..3..2..2....3..1..2..0....2..2..3..1....2..3..1..1

..1..3..3..2....1..3..2..2....3..1..2..0....2..2..3..1....2..3..1..1

CROSSREFS

Cf. A268159.

Sequence in context: A222780 A206636 A244841 * A082027 A203106 A069031

Adjacent sequences:  A268158 A268159 A268160 * A268162 A268163 A268164

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 27 2016

STATUS

approved

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Last modified September 28 04:37 EDT 2020. Contains 337392 sequences. (Running on oeis4.)