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A154968
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a(n)=4*a(n-1)+12*a(n-2), n>2 ; a(0)=1, a(1)=1, a(2)=7 .
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1
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1, 1, 7, 40, 244, 1456, 8752, 52480, 314944, 1889536, 11337472, 68024320, 408146944, 2448879616, 14693281792, 88159682560, 528958111744, 3173748637696, 19042491891712, 114254951219200, 685529707577344
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