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A134772
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Let f(M,N)=2^(-M)*sum_{i=0..N} {(-1)^{i}M!N!(2M-2i)!}/{i!(M-i)!(N-i)!6^{N-i}}; then a(n) = f(2n,n).
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4
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1, 0, 28, 14400, 27165600, 134289792000, 1445549490000000, 29865588836219136000, 1081114481157129619200000, 64007711015400701105356800000, 5873237165016878140678626432000000, 799901135455942846519287494400000000000, 156064894765355001368149078831725782016000000
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