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A068751
Number of potential flows in n X n array with integer velocities in -4..4, i.e., number of n X n arrays with adjacent elements differing by no more than 4, counting arrays differing by a constant only once.
0
1, 489, 9230193, 6913624013061, 207345516734034667209
OFFSET
1,2
CROSSREFS
By size 3 X 3, ..., 6 X 6 A068744-A068747, by velocity limit 1..14 A068248-A068761, solenoidal flows A068722-A068738.
Sequence in context: A230005 A221940 A221739 * A172951 A287329 A303556
KEYWORD
nonn
AUTHOR
R. H. Hardin, Feb 27 2002
STATUS
approved