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A299550 Number of nX4 0..1 arrays with every element equal to 2, 3, 4, 5, 6 or 8 king-move adjacent elements, with upper left element zero. 1
0, 6, 31, 220, 2034, 17565, 160089, 1456436, 13302816, 121652326, 1112865108, 10182885689, 93181023707, 852706356608, 7803285220578, 71409806459026, 653490536943175, 5980275180936940, 54727198227817023, 500824234677257132 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A299554.

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +25*a(n-2) -192*a(n-3) -422*a(n-4) +1520*a(n-5) +3746*a(n-6) -5878*a(n-7) -14143*a(n-8) +10086*a(n-9) +25736*a(n-10) -9714*a(n-11) -23623*a(n-12) +28162*a(n-13) -20177*a(n-14) -78514*a(n-15) +74384*a(n-16) -3735*a(n-17) +61742*a(n-18) -245675*a(n-19) +588540*a(n-20) -584889*a(n-21) +393834*a(n-22) -83403*a(n-23) -420316*a(n-24) +666471*a(n-25) -659704*a(n-26) +484095*a(n-27) -167364*a(n-28) -56108*a(n-29) +130154*a(n-30) -58937*a(n-31) +40791*a(n-32) -21746*a(n-33) -467*a(n-34) -3163*a(n-35) +3110*a(n-36) -492*a(n-37) for n>38

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A299554.

Sequence in context: A121754 A200775 A244255 * A208594 A318539 A221514

Adjacent sequences:  A299547 A299548 A299549 * A299551 A299552 A299553

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 12 2018

STATUS

approved

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Last modified May 31 07:14 EDT 2020. Contains 334747 sequences. (Running on oeis4.)