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A025248
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a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-3)*a(3) for n >= 4.
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1
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1, 0, 2, 2, 2, 6, 14, 26, 58, 142, 326, 754, 1826, 4438, 10750, 26378, 65354, 162334, 405046, 1016546, 2561074, 6472550, 16415086, 41761786, 106526810, 272411054, 698275622, 1793763282, 4617047618, 11906277750, 30757124830, 79582907370, 206231537770
(list; graph; refs; listen; history; internal format)
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