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A228215 Number of second differences of arrays of length n+2 of numbers in 0..5 2
21, 271, 2731, 23351, 176851, 1225631, 8006491, 50556551, 313882531, 1932641711, 11839990891, 72260648471, 439667406451, 2668522016831, 16163719991611, 97745259402791, 590286253682371, 3560791008422351, 21460113482174731 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A228218
LINKS
FORMULA
Empirical: a(n) = 11*a(n-1) -30*a(n-2) for n>11
EXAMPLE
Some solutions for n=4
..1....2...-1...-7...-4..-10...-6....1....2....8...-3....2...-6...-3....5....6
.-4....2...-3....5....0....8....5....2...-5...-2....1...-2....8....0...-3...-9
..1...-2...-1...-1....7...-3....2....0....4...-3....4....6...-1....3...-1....5
..5....3....6....2...-5...-2...-3....5....3....5...-8...-5...-5...-1....6....3
CROSSREFS
Sequence in context: A215766 A320819 A360499 * A032535 A022745 A225967
KEYWORD
nonn
AUTHOR
R. H. Hardin Aug 16 2013
STATUS
approved

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Last modified February 24 04:32 EST 2024. Contains 370288 sequences. (Running on oeis4.)