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A081698 Expansion of ( 1 - Sqrt[ 1 - 4 x Sqrt[ 1 + 4 x ] ] )/( 2 x ). 1
1, 3, 4, 21, 56, 282, 984, 4813, 19280, 93150, 403672, 1945954, 8845360, 42766292, 200419504, 974134461, 4659558048, 22785183670, 110564976792, 543935554390, 2667398588272, 13196971915628, 65238895435792, 324431740601618 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

G.f.: ( 1 - Sqrt[ 1 - 4 x Sqrt[ 1 + 4 x ] ] )/( 2 x )

CROSSREFS

Cf. A081696.

Sequence in context: A034475 A156173 A094632 * A012123 A012255 A012247

Adjacent sequences:  A081695 A081696 A081697 * A081699 A081700 A081701

KEYWORD

easy,nonn

AUTHOR

Emanuele Munarini (munarini(AT)mate.polimi.it), Apr 02 2003

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Last modified February 16 02:51 EST 2012. Contains 205860 sequences.