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A105696 Expansion of (1-x)/sqrt((1-3x)/(1+x)). 1
1, 1, 2, 6, 16, 44, 122, 342, 966, 2746, 7846, 22514, 64836, 187288, 542438, 1574666, 4580400, 13347324, 38956182, 113861922, 333226560, 976353876, 2863756158, 8407877394, 24707200854, 72663608178, 213864889770, 629893319902 (list; graph; refs; listen; history; internal format)
OFFSET

0,3

COMMENTS

Apply the Riordan array (1-x,x/(1+x)) to C(2n,n).

FORMULA

a(n)=A002426(n)-A002426(n-2); a(n)=sum{k=0..floor(n/2), 2*C(n-2, k)C(n-k, k)}-C(1, n)

CROSSREFS

Sequence in context: A105073 A002605 A026134 * A074413 A055544 A126285

Adjacent sequences:  A105693 A105694 A105695 * A105697 A105698 A105699

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Apr 17 2005

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Last modified February 14 07:54 EST 2012. Contains 205599 sequences.