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A186941
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a(n)=2^C(n,2)*(2(4^n-n*2^n)-1).
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2
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1, 3, 30, 632, 24512, 1768448, 243236864, 64959283200, 34084592025600, 35395409601888256, 73066365170086838272, 300608105396373834170368, 2468626449866096479911804928, 40500446023029046169942454435840, 1328092178371231300789305464410079232
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