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A273939
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a(0) = 1, a(1) = 2; for k>0, a(2*k) = k*a(2*k-1) + a(2*k-2), a(2*k+1) = a(2*k) + a(2*k-1).
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1
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1, 2, 3, 5, 13, 18, 67, 85, 407, 492, 2867, 3359, 23021, 26380, 207681, 234061, 2080169, 2314230, 22908239, 25222469, 275132929, 300355398, 3579042307, 3879397705, 50131814767, 54011212472, 752277576903, 806288789375, 12040320628153
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OFFSET
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0,2
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LINKS
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FORMULA
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CROSSREFS
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KEYWORD
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nonn
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AUTHOR
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STATUS
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approved
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