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A194779 Number of lower triangles of a (2n-1)X(2n-1) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor 0
1, 7, 43, 268, 1740, 11862, 85013, 639760, 5045610, 41615165, 358185399, 3210667490, 29914284833, 289187621900, 2895861006415 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 1 of A194778

LINKS

Table of n, a(n) for n=1..15.

EXAMPLE

All solutions for n=2 containing a 2

..0

..1.1

..1.1.2

CROSSREFS

Sequence in context: A022036 A277670 A015451 * A126502 A286911 A277188

Adjacent sequences:  A194776 A194777 A194778 * A194780 A194781 A194782

KEYWORD

nonn

AUTHOR

R. H. Hardin Sep 02 2011

STATUS

approved

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Last modified December 9 20:24 EST 2018. Contains 318023 sequences. (Running on oeis4.)