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A202967 Number of arrays of 7 integers in -n..n with sum zero and adjacent elements differing in absolute value 1
6, 524, 9872, 66208, 289536, 941086, 2537024, 5933492, 12515772, 24295760, 44188086, 76110890, 125357152, 198686606, 304811136, 454458544, 660981870, 940393644, 1312104510, 1798910920, 2427885688, 3230300850, 4242680088 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 5 of A202962
LINKS
FORMULA
Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -2*a(n-5) +a(n-6) -3*a(n-7) +3*a(n-8) -a(n-9) +2*a(n-10) +a(n-11) -a(n-13) -2*a(n-14) +a(n-15) -3*a(n-16) +3*a(n-17) -a(n-18) +2*a(n-19) -a(n-21) +a(n-22) -2*a(n-23) +a(n-24)
EXAMPLE
Some solutions for n=4
..4....0....2...-4....3...-2...-2...-3....0...-1...-2....3....2....0....0...-4
.-2...-3....3....2....0....3...-4...-1...-1....3....3...-2....3....3....3....2
..4...-1....0...-4...-2...-1....1....0...-4....4...-4....1...-2...-1....4...-4
..0....2...-4....2....1...-3...-4....2....2....3....1....2....3...-2...-2....1
.-3....4...-2...-1...-4....0....2....1...-4...-2....0....0...-4....4...-4...-2
..1....0...-3....3...-1....4....4....2....3...-4....4...-4....0....0....2....4
.-4...-2....4....2....3...-1....3...-1....4...-3...-2....0...-2...-4...-3....3
CROSSREFS
Sequence in context: A222607 A000411 A180431 * A230330 A252174 A251697
KEYWORD
nonn
AUTHOR
R. H. Hardin Dec 26 2011
STATUS
approved

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Last modified May 23 20:54 EDT 2024. Contains 372765 sequences. (Running on oeis4.)