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A122249 Numerators of Hankel transform of 1/(2n+1). 1
1, 4, 256, 65536, 1073741824, 70368744177664, 73786976294838206464, 309485009821345068724781056, 332306998946228968225951765070086144, 1427247692705959881058285969449495136382746624 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Conjecture - requires proof.

LINKS

Table of n, a(n) for n=0..9.

FORMULA

a(n)=4^A122247(n); a(n)=4^sum{k=1..n, sum{j=0..n, floor(k/2^j)}};

CROSSREFS

Sequence in context: A071617 A223755 A223844 * A326556 A223795 A207275

Adjacent sequences:  A122246 A122247 A122248 * A122250 A122251 A122252

KEYWORD

easy,nonn

AUTHOR

Paul Barry, Aug 27 2006

STATUS

approved

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Last modified July 4 15:43 EDT 2020. Contains 335448 sequences. (Running on oeis4.)