A192661 Floor-Sqrt transform of central Stirling numbers of the second kind (A007820).

1, 1, 2, 9, 41, 206, 1150, 7023, 46279, 325845, 2432608, 19138508, 157893016, 1360356046, 12197663221, 113489506443, 1092914231524, 10869407462093, 111421588497433, 1175241503062627, 12735340966302227, 141585732942425447, 1612917155538690101

Offset

0,3

Links

Table of n, a(n) for n=0..22.

Formula

a(n) = floor(sqrt(stirling2(2*n,n))).

Mathematica

 Table[Floor[Sqrt[StirlingS2[2n, n]]], {n, 0, 100}]

Prog

 (Maxima) makelist(floor(sqrt(stirling2(2*n, n))), n, 0, 24);

Crossrefs

Sequence in context: A270766 A181375 A152052 * A020038 A330016 A056845

Adjacent sequences: A192658 A192659 A192660 * A192662 A192663 A192664

Keyword

nonn

Author

Emanuele Munarini, Jul 07 2011

Status

approved