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Number of ways to place n objects in an (n-1) X (n-1) array (e.g., the number of ways to arrange stars in a flag's field pattern).
Table of n, a(n) for n=1..18.
f[n_] := Binomial[(n - 1)^2, n]; Array[f, 18] (* Robert G. Wilson v, Jul 25 2010 *)
Sequence in context: A116944 A124260 A253099 * A054053 A070781 A152421
Adjacent sequences: A178839 A178840 A178841 * A178843 A178844 A178845
Thomas Young, Jun 17 2010