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A178842 a(n) = C((n-1)^2, n) 0
0, 0, 4, 126, 4368, 177100, 8347680, 450978066, 27540584512, 1878392407320, 141629804643600, 11703541346076580, 1052134368066259632, 102250849636865496528, 10683770265451303535424, 1194448077521704400002650, 142288257910903254700704000, 17993390003427864738863790640 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

COMMENTS

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).

LINKS

Table of n, a(n) for n=1..18.

MATHEMATICA

f[n_] := Binomial[(n - 1)^2, n]; Array[f, 18] (* Robert G. Wilson v, Jul 25 2010 *)

CROSSREFS

Sequence in context: A116944 A124260 A253099 * A054053 A070781 A152421

Adjacent sequences:  A178839 A178840 A178841 * A178843 A178844 A178845

KEYWORD

nonn

AUTHOR

Thomas Young, Jun 17 2010

STATUS

approved

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Last modified August 22 20:19 EDT 2017. Contains 290951 sequences.