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 A068724 Number of solenoidal flows (flow in = flow out) in a 5 X 5 square array with integer velocities -n .. n. 3
 1, 569397, 1305759171, 251611610655, 13336307324915, 322309309862183 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS EXAMPLE Sample flows (. represents a space): Numbers in long rows are on cell walls showing velocity rightward. Numbers in long columns are on cell floors showing velocity downwards. 5 X 5 cell centers are at the intersection of long rows and long columns. n=1: .. 0 . 0 . 0 . 0 . 0 .0. -1. -1. -1. -1 . 0 .. 1 . 0 . 0 . 0. -1 .0 . 0. -1. -1 . 0 . 0 .. 1 . 1 . 0. -1. -1 .0 . 0 . 0 . 0 . 0 . 0 .. 1 . 1 . 0. -1. -1 .0 . 0 . 1 . 1 . 0 . 0 .. 1 . 0 . 0 . 0. -1 .0 . 1 . 1 . 1 . 1 . 0 .. 0 . 0 . 0 . 0 . 0 n=2: .. 0 . 0 . 0 . 0 . 0 .0. -2. -1. -1. -1 . 0 .. 2. -1 . 0 . 0. -1 .0 . 0. -2. -2. -1 . 0 .. 2 . 1 . 0. -1. -2 .0 . 0. -1. -1 . 0 . 0 .. 2 . 2 . 0. -2. -2 .0 . 0 . 2 . 2 . 0 . 0 .. 2 . 0 . 0 . 0. -2 .0 . 2 . 2 . 2 . 2 . 0 .. 0 . 0 . 0 . 0 . 0 CROSSREFS Cf. 2 X 2=1, 3, 5, 7..., 3 X 3 A068722, 4 X 4 A068723, 6x6 A068725, by velocity limit 1..13 A068726-A068738. Sequence in context: A237935 A237693 A156412 * A233651 A288085 A121169 Adjacent sequences: A068721 A068722 A068723 * A068725 A068726 A068727 KEYWORD nonn AUTHOR R. H. Hardin, Feb 26 2002 STATUS approved

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Last modified March 26 21:04 EDT 2023. Contains 361552 sequences. (Running on oeis4.)