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A034871 Odd-numbered rows of Pascal's triangle. 2
1, 1, 1, 3, 3, 1, 1, 5, 10, 10, 5, 1, 1, 7, 21, 35, 35, 21, 7, 1, 1, 9, 36, 84, 126, 126, 84, 36, 9, 1, 1, 11, 55, 165, 330, 462, 462, 330, 165, 55, 11, 1, 1, 13, 78, 286, 715, 1287, 1716, 1716, 1287, 715, 286, 78, 13, 1, 1, 15, 105, 455, 1365, 3003, 5005 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..62.

PROG

(Haskell)

a034871 n = a034871_list !! n

a034871_list = concat $ map ([1, 1] ^) [1, 3..]

instance Num a => Num [a] where

   fromInteger k = [fromInteger k]

   (p:ps) + (q:qs) = p + q : ps + qs

   ps + qs         = ps ++ qs

   (p:ps) * qs'@(q:qs) = p * q : ps * qs' + [p] * qs

   _ * _               = []

-- Reinhard Zumkeller, Apr 02 2011

CROSSREFS

Cf. A007318, A034870.

Sequence in context: A132729 A196493 A196989 * A015109 A157636 A086626

Adjacent sequences:  A034868 A034869 A034870 * A034872 A034873 A034874

KEYWORD

nonn,tabl,easy

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified October 31 22:26 EDT 2014. Contains 248871 sequences.