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A239188 Number of n X 2 0..4 arrays with no element equal to the sum of elements to its left or the sum of elements above it, modulo 5. 1
12, 120, 1276, 13128, 136684, 1416192, 14700364, 152485288, 1582134540, 16414034784, 170295680876, 1766793480968, 18330328103340, 190175177307584, 1973048416742796, 20470174034391656, 212375968504319052 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
LINKS
FORMULA
Empirical: a(n) = 6*a(n-1) + 50*a(n-2) - 26*a(n-3) - 253*a(n-4) + 240*a(n-5) + 416*a(n-6) - 624*a(n-7).
Empirical g.f.: 4*x*(3 + 12*x - 11*x^2 - 54*x^3 + 68*x^4 + 86*x^5 - 156*x^6) / (1 - 6*x - 50*x^2 + 26*x^3 + 253*x^4 - 240*x^5 - 416*x^6 + 624*x^7). - Colin Barker, Oct 25 2018
EXAMPLE
Some solutions for n=5:
..4..1....4..3....2..3....1..3....2..3....3..2....2..1....3..2....1..4....1..2
..1..0....1..0....3..0....3..0....3..1....1..0....1..3....1..4....4..3....4..1
..3..4....4..0....2..0....3..0....1..0....2..1....1..2....1..3....4..1....1..0
..2..3....2..4....1..2....4..0....2..1....2..1....2..0....4..1....3..1....3..1
..2..4....2..0....2..4....3..4....2..1....1..2....2..4....1..3....3..1....1..0
CROSSREFS
Column 2 of A239194.
Sequence in context: A361573 A129064 A120585 * A200163 A012565 A012621
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 11 2014
STATUS
approved

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Last modified June 19 00:22 EDT 2024. Contains 373492 sequences. (Running on oeis4.)