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A287153
Number of matchings in the graph P_2 X P_n X P_n.
1
1, 2, 108, 90040, 1441534384, 423657524608288, 2303329608950881340608, 231357371294195870227169041024, 429425508267098531071850722486436668160
OFFSET
0,2
FORMULA
a(n) = Sum_{k=0..n^2} A287152(n,k).
CROSSREFS
Row sums of A287152.
Sequence in context: A157067 A364616 A375841 * A372117 A247098 A245056
KEYWORD
nonn
AUTHOR
Alois P. Heinz, May 20 2017
STATUS
approved