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A304928 Number of nX5 0..1 arrays with every element unequal to 0, 1, 3, 5 or 7 king-move adjacent elements, with upper left element zero. 1
8, 53, 54, 173, 452, 1034, 2265, 5306, 12135, 28127, 66067, 153211, 354736, 824768, 1914999, 4443576, 10323903, 23978120, 55672201, 129295766, 300273962, 697273340, 1619276716, 3760493158, 8732808930, 20280042854, 47096264941 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A304931.
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) +3*a(n-3) -2*a(n-4) -a(n-5) +6*a(n-6) -15*a(n-7) -7*a(n-8) -10*a(n-9) -3*a(n-10) -13*a(n-11) -13*a(n-12) +62*a(n-13) +39*a(n-14) +29*a(n-15) +13*a(n-16) +55*a(n-17) +10*a(n-18) -64*a(n-19) -46*a(n-20) -12*a(n-21) -90*a(n-22) -58*a(n-23) +22*a(n-24) -20*a(n-25) +5*a(n-26) -39*a(n-27) +8*a(n-28) +34*a(n-29) +37*a(n-30) -4*a(n-31) +9*a(n-32) -6*a(n-33) +4*a(n-34) for n>45
EXAMPLE
Some solutions for n=5
..0..0..0..1..0. .0..0..0..1..0. .0..1..0..0..0. .0..1..0..0..0
..1..0..0..0..0. .0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..1
..0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0. .0..0..0..0..0
..0..0..0..0..0. .0..0..0..0..1. .0..0..0..0..0. .0..0..0..0..0
..0..1..0..0..0. .1..0..0..1..1. .0..0..0..1..0. .1..0..0..0..1
CROSSREFS
Cf. A304931.
Sequence in context: A302865 A116171 A303966 * A305344 A316612 A304666
KEYWORD
nonn
AUTHOR
R. H. Hardin, May 21 2018
STATUS
approved

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Last modified June 15 15:25 EDT 2024. Contains 373407 sequences. (Running on oeis4.)