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A068729
Number of solenoidal flows (flow in = flow out) in an n X n square array with integer velocities in -4 .. 4.
0
1, 9, 2501, 28905785, 13336307324915, 247753867499441888279, 185592614324336736251073584343
OFFSET
1,2
CROSSREFS
By size 3 X 3, ..., 6 X 6 A068722-A068725, by velocity limit 1..13 A068726-A068738.
Sequence in context: A278914 A069704 A033997 * A321282 A159775 A281538
KEYWORD
nonn,more
AUTHOR
R. H. Hardin, Feb 26 2002
EXTENSIONS
a(6)-a(7) from Sean A. Irvine, Mar 08 2024
STATUS
approved