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A101926 a(n) = 2^A101925(n). 8
2, 4, 16, 32, 256, 512, 2048, 4096, 65536, 131072, 524288, 1048576, 8388608, 16777216, 67108864, 134217728, 4294967296, 8589934592, 34359738368, 68719476736, 549755813888, 1099511627776, 4398046511104, 8796093022208 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,1

COMMENTS

a(n) is the numerator of 2^(2*n+1)*(n!)^2/(2*n+1)/(2*n)!. The corresponding denominator is A001803. - Daniel Suteu, Feb 03 2017

LINKS

Table of n, a(n) for n=0..23.

Index to divisibility sequences

MAPLE

denom((binomial(2n, n)*4^-n)/2); # Stephen Crowley, Mar 05 2007

MATHEMATICA

Table[Numerator[Beta[1, n + 1, 1/2]], {n, 0, 22}] (* Gerry Martens, Nov 13 2016 *)

CROSSREFS

Bisection of A036069 and of A086117.

Cf. A001803.

Sequence in context: A094384 A053038 A001088 * A087965 A074411 A189838

Adjacent sequences:  A101923 A101924 A101925 * A101927 A101928 A101929

KEYWORD

nonn

AUTHOR

Ralf Stephan, Dec 28 2004

EXTENSIONS

More terms from Joshua Zucker, May 15 2006

STATUS

approved

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Last modified October 15 14:04 EDT 2018. Contains 316236 sequences. (Running on oeis4.)