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A248438 Number of length 5+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third 1
2, 9, 36, 165, 342, 601, 884, 1381, 1922, 2533, 3144, 3957, 4770, 5613, 6524, 7697, 8870, 10149, 11428, 12873, 14362, 15857, 17352, 19165, 21026, 22893, 24804, 26841, 28878, 31061, 33244, 35697, 38170, 40649, 43200, 45977, 48754, 51537, 54340, 57421 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 5 of A248433
LINKS
FORMULA
Empirical: a(n) = a(n-1) -a(n-2) -a(n-6) +2*a(n-7) -3*a(n-8) +3*a(n-9) -a(n-10) +2*a(n-13) -3*a(n-14) +4*a(n-15) -4*a(n-16) +3*a(n-17) -a(n-18) -a(n-20) +3*a(n-21) -4*a(n-22) +4*a(n-23) -3*a(n-24) +2*a(n-25) -a(n-28) +3*a(n-29) -3*a(n-30) +2*a(n-31) -a(n-33) +a(n-34) -a(n-36) +a(n-37) -2*a(n-39) +3*a(n-40) -3*a(n-41) +a(n-42) -2*a(n-45) +3*a(n-46) -4*a(n-47) +4*a(n-48) -3*a(n-49) +a(n-50) +a(n-52) -3*a(n-53) +4*a(n-54) -4*a(n-55) +3*a(n-56) -2*a(n-57) +a(n-60) -3*a(n-61) +3*a(n-62) -2*a(n-63) +a(n-64) +a(n-68) -a(n-69) +a(n-70)
EXAMPLE
Some solutions for n=6
..0....0....1....2....2....6....5....6....3....6....6....6....6....0....3....2
..2....4....1....1....2....2....1....2....2....4....4....4....4....2....5....3
..1....2....1....0....2....4....3....4....4....5....2....2....2....1....4....4
..3....0....1....2....2....3....5....3....6....3....0....3....3....3....3....5
..5....1....1....4....2....5....1....5....5....4....1....4....1....5....2....6
..1....2....1....3....2....4....3....1....4....2....2....2....2....4....4....4
..3....3....1....5....2....3....5....3....3....0....0....3....0....6....0....2
CROSSREFS
Sequence in context: A150972 A150973 A150974 * A288780 A150975 A150976
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 06 2014
STATUS
approved

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Last modified February 22 13:38 EST 2024. Contains 370256 sequences. (Running on oeis4.)