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A298419
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a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.
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1
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1, 1, 1, 3, 12, 58, 339, 2318, 18217, 161647, 1598311, 17419832, 207440012, 2679300663, 37302771588, 556862275475, 8872493654229, 150275529864635, 2696087044070848, 51075378307643124, 1018811479110389943, 21343965683012143990, 468548433547174197669
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OFFSET
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0,4
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LINKS
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MATHEMATICA
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a[0] = 1; a[1] = 1; a[2] = 1;
a[n_] := a[n] = n a[n - 1] - a[n - 2] + a[Floor[n/2]];
Table[a[n], {n, 0, 30}] (* A298419 *)
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CROSSREFS
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KEYWORD
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nonn,easy
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AUTHOR
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STATUS
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approved
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