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A304475 Number of nX4 0..1 arrays with every element unequal to 0, 1, 2, 4 or 6 king-move adjacent elements, with upper left element zero. 1
8, 24, 37, 110, 297, 869, 2325, 6379, 17568, 48401, 132571, 364655, 1002589, 2754738, 7567524, 20801769, 57166345, 157087321, 431686614, 1186366477, 3260212654, 8959296665, 24621148350, 67661598847, 185940093307, 510981495243 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A304479.

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +7*a(n-3) +7*a(n-4) -14*a(n-5) -28*a(n-6) -56*a(n-7) -65*a(n-8) -77*a(n-9) +31*a(n-10) +280*a(n-11) +458*a(n-12) +484*a(n-13) +398*a(n-14) +320*a(n-15) -333*a(n-16) -1155*a(n-17) -1849*a(n-18) -2523*a(n-19) -2612*a(n-20) -1778*a(n-21) +445*a(n-22) +2555*a(n-23) +4684*a(n-24) +7438*a(n-25) +7323*a(n-26) +4721*a(n-27) +1048*a(n-28) -1452*a(n-29) -6069*a(n-30) -11167*a(n-31) -10559*a(n-32) -6445*a(n-33) -3475*a(n-34) -2108*a(n-35) +2357*a(n-36) +8323*a(n-37) +7696*a(n-38) +5753*a(n-39) +4296*a(n-40) +3014*a(n-41) +73*a(n-42) -2650*a(n-43) -2475*a(n-44) -2110*a(n-45) -2531*a(n-46) -2247*a(n-47) -526*a(n-48) +835*a(n-49) +429*a(n-50) -103*a(n-51) +197*a(n-52) +558*a(n-53) +517*a(n-54) +283*a(n-55) +4*a(n-56) -156*a(n-57) -91*a(n-58) +29*a(n-59) +68*a(n-60) -72*a(n-61) -100*a(n-62) -32*a(n-63) +32*a(n-64) +24*a(n-65) for n>67

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A304479.

Sequence in context: A305241 A044450 A134223 * A316300 A050427 A329549

Adjacent sequences:  A304472 A304473 A304474 * A304476 A304477 A304478

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 13 2018

STATUS

approved

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Last modified September 23 00:32 EDT 2021. Contains 347609 sequences. (Running on oeis4.)