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A273160 a(n) = Sum_{k=1..n} C(n, floor((n-k)/k)). 3
0, 1, 3, 5, 10, 13, 30, 39, 84, 143, 290, 424, 1120, 1697, 3521, 6633, 14012, 22721, 53529, 88607, 189749, 356024, 730697, 1256272, 2889484, 5006918, 10399649, 19706342, 40954970, 72663140, 160499071, 286286349, 597385864, 1134282375, 2340807724, 4251969339 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..35.

MAPLE

A273160:=n->add(binomial(n, floor((n-i)/i)), i=1..n): seq(A273160(n), n=0..50);

MATHEMATICA

Table[Sum[Binomial[n, Floor[(n - i)/i]], {i, n}], {n, 0, 40}]

CROSSREFS

Cf. A051054, A273161.

Sequence in context: A160792 A137395 A001767 * A285138 A310018 A048214

Adjacent sequences:  A273157 A273158 A273159 * A273161 A273162 A273163

KEYWORD

nonn,easy

AUTHOR

Wesley Ivan Hurt, May 16 2016

STATUS

approved

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Last modified March 19 15:02 EDT 2019. Contains 321330 sequences. (Running on oeis4.)