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A111288
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a(1) = a(2) = a(3) = a(4) = 1. For n>= 5, a(n) = a(n-1)*a(n-3) + a(n-2)*a(n-4).
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3
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1, 1, 1, 1, 2, 3, 5, 13, 49, 284, 3937, 196605, 56028733, 220640957641, 43379336062130626, 2430489281321503732285663, 536265482569392926735606762349877841, 23262840586898349755381222452865322555989091379459449
(list; graph; refs; listen; history; internal format)
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