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A300608
Number of n X 4 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
1
2, 30, 277, 2347, 19532, 164619, 1387896, 11697909, 98591087, 830954473, 7003554684, 59028229212, 497509382092, 4193173792143, 35341458756838, 297869535158874, 2510543242339775, 21159691214336637, 178340896550028412
OFFSET
1,1
COMMENTS
Column 4 of A300612.
FORMULA
Empirical recurrence of order 72 (see link above).
EXAMPLE
Some solutions for n=5
..0..0..0..0. .0..0..1..1. .0..1..0..0. .0..0..1..0. .0..0..0..0
..1..1..0..1. .1..1..0..0. .0..1..0..1. .0..1..1..0. .1..1..1..1
..0..1..0..1. .0..1..0..1. .1..0..1..1. .1..0..0..1. .0..1..0..0
..0..0..1..0. .0..1..1..0. .0..1..0..1. .1..1..1..1. .0..0..1..0
..1..1..0..0. .0..0..1..0. .1..1..0..0. .1..0..0..1. .0..1..1..1
CROSSREFS
Cf. A300612.
Sequence in context: A368498 A300423 A300685 * A301350 A036351 A189770
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 09 2018
STATUS
approved