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A194073
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a(n) = 1 + floor((3/4)*n^2).
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4
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1, 4, 7, 13, 19, 28, 37, 49, 61, 76, 91, 109, 127, 148, 169, 193, 217, 244, 271, 301, 331, 364, 397, 433, 469, 508, 547, 589, 631, 676, 721, 769, 817, 868, 919, 973, 1027, 1084, 1141, 1201, 1261, 1324, 1387, 1453, 1519, 1588, 1657, 1729, 1801
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OFFSET
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1,2
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LINKS
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FORMULA
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a(n) = 1 + floor((3/4)*n^2).
G.f.: x*(1+2*x-x^2+x^3) / ( (1+x)*(1-x)^3 ). - R. J. Mathar, Aug 25 2011
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MATHEMATICA
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c[k_]:=1+Floor[(3/4)k^2];
Table[c[k], {k, 1, 90}]
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PROG
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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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