|
|
A200426
|
|
Number of -4..4 arrays x(0..n+2) of n+3 elements with zero sum and no two or three adjacent elements summing to zero
|
|
1
|
|
|
248, 1830, 11008, 67852, 473034, 3397130, 24220966, 171351382, 1214558880, 8651325238, 61876262346, 443696753874, 3187550880360, 22937925283316, 165329774491030, 1193432351805558, 8626352984960916, 62427556201202018
(list;
graph;
refs;
listen;
history;
text;
internal format)
|
|
|
OFFSET
|
1,1
|
|
COMMENTS
|
|
|
LINKS
|
|
|
EXAMPLE
|
Some solutions for n=3
.-4...-1...-2...-4....1...-4...-2....0....3...-2....2....1....3....3....3....4
..2....3....3...-1...-3....1...-3....4...-2....4....0....1....2....0....4....4
..3....4....1....0....0...-2...-1...-3....0...-3....3....2....0....2....0...-2
.-2....0...-3...-1...-1....4....3....0...-4....2...-4....0....2...-1...-2...-4
..3...-3...-2....3....3...-3....0...-1....1...-1....0...-4...-3...-2...-3...-1
.-2...-3....3....3....0....4....3....0....2....0...-1....0...-4...-2...-2...-1
|
|
CROSSREFS
|
|
|
KEYWORD
|
nonn
|
|
AUTHOR
|
|
|
STATUS
|
approved
|
|
|
|