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1, 4, 8, 14, 21, 29, 39, 50, 62, 76, 91, 107, 125, 144, 164, 186, 209, 233, 259, 286, 314, 344, 375, 407, 441, 476, 512, 550, 589, 629, 671, 714, 758, 804, 851, 899, 949, 1000, 1052, 1106, 1161, 1217, 1275, 1334, 1394, 1456, 1519, 1583, 1649, 1716, 1784, 1854, 1925, 1997, 2071
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refs;
listen;
history;
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OFFSET
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1,2
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LINKS
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Table of n, a(n) for n=1..55.
Index entries for sequences related to linear recurrences with constant coefficients, signature (2,-1,1,-2,1).
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FORMULA
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a(n)=n-1+ceiling((2/3)n^2).
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MATHEMATICA
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a=3/2; b=0;
Table[n+Floor[(a*n+b)^(1/2)], {n, 100}]
Table[n-1+Ceiling[(n*n-b)/a], {n, 80}]
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CROSSREFS
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Cf. A183874.
Sequence in context: A121896 A173290 A131937 * A088804 A027924 A006578
Adjacent sequences: A183854 A183855 A183856 * A183858 A183859 A183860
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KEYWORD
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nonn,easy
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AUTHOR
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Clark Kimberling, Jan 07 2011
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STATUS
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approved
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