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A099576 Row sums of triangle A099575. 1
1, 2, 6, 12, 35, 72, 210, 440, 1287, 2730, 8008, 17136, 50388, 108528, 319770, 692208, 2042975, 4440150, 13123110, 28614300, 84672315, 185122080, 548354040, 1201610592, 3562467300, 7821594872, 23206929840, 51037462560, 151532656696 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

FORMULA

a(n)=sum{k=0..n, sum{j=0..floor(k/2), binomial(n+j, j)}.

CROSSREFS

Cf. A029907.

Sequence in context: A088808 A076278 A204512 * A026549 A120766 A121404

Adjacent sequences:  A099573 A099574 A099575 * A099577 A099578 A099579

KEYWORD

easy,nonn

AUTHOR

Paul Barry (pbarry(AT)wit.ie), Oct 23 2004

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Last modified February 13 22:36 EST 2012. Contains 205567 sequences.