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A111289
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a(1) = a(2) = a(3) = a(4) = 1. For n>= 5, a(n) = a(n-1)*a(n-4) + a(n-2)*a(n-3).
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0
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1, 1, 1, 1, 2, 3, 5, 11, 37, 166, 1237, 19749, 936055, 179814643, 240916863586, 4926183534613279, 4654499108310829164143, 838133896191338105830469104443, 201943518452400520392903690464302135967495, 994814736615560793049792416556718062880283217474796953454
(list; graph; refs; listen; history; internal format)
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