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A052115 Number of nonnegative integer pairs (i,j) with binomial(i+r,r) + binomial(j+r,r) <= binomial(n+r,r), r=2. 3
0, 1, 4, 8, 13, 22, 30, 41, 52, 66, 83, 98, 117, 135, 158, 183, 205, 232, 259, 288, 322, 351, 390, 422, 459, 498, 536, 585, 624, 669, 715, 762, 815, 863, 916, 975, 1030, 1088, 1141, 1208, 1272, 1333, 1398, 1460, 1535, 1606, 1677, 1749, 1824, 1901 (list; graph; refs; listen; history; text; internal format)
OFFSET
0,3
LINKS
PROG
(PARI) a(n) = {nb = 0; for (i=0, n, for (j=0, n, if (binomial(i+2, 2) + binomial(j+2, 2) <= binomial(n+2, 2), nb++); ); ); return (nb); } \\ Michel Marcus, Jun 10 2013
CROSSREFS
Sequence in context: A160395 A038793 A036709 * A007882 A265258 A009852
KEYWORD
nonn
AUTHOR
Klaus Strassburger (strass(AT)ddfi.uni-duesseldorf.de), Jan 21 2000
STATUS
approved

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Last modified March 19 04:58 EDT 2024. Contains 370952 sequences. (Running on oeis4.)