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A302001 Number of 4Xn 0..1 arrays with every element equal to 1, 2 or 4 horizontally or antidiagonally adjacent elements, with upper left element zero. 1
0, 13, 15, 74, 468, 2036, 10982, 53440, 271596, 1360466, 6832459, 34345485, 172485648, 866676017, 4353899691, 21873626234, 109891360736, 552080909728, 2773601514082, 13934283247296, 70004406947220, 351694969884786 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 4 of A301999.

LINKS

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

EXAMPLE

Some solutions for n=5

..0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0. .0..0..1..1..0

..0..0..0..0..0. .1..1..1..0..0. .0..0..1..0..1. .0..0..1..0..0

..1..1..0..1..1. .1..0..1..1..1. .0..1..0..1..0. .0..1..1..0..1

..1..1..1..0..0. .0..1..0..0..0. .1..0..1..0..0. .0..0..0..1..1

CROSSREFS

Cf. A301999.

Sequence in context: A217252 A299593 A318543 * A109018 A237912 A268664

Adjacent sequences:  A301998 A301999 A302000 * A302002 A302003 A302004

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 30 2018

STATUS

approved

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Last modified July 2 21:48 EDT 2022. Contains 355029 sequences. (Running on oeis4.)