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A051406
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a(n) = (3^n+1) * (3^(n+1)+1) / 8.
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2
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1, 5, 35, 287, 2501, 22265, 199655, 1794707, 16145801, 145292525, 1307573675, 11767985927, 105911341901, 953200482785, 8578799562095, 77209181709947, 694882592342801, 6253943201945045, 56285488430084915, 506569394708502767, 4559124548889740501
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