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A118677 Number of Motzkin paths of length n in 3D with no level steps at odd level. 0
1, 2, 6, 18, 60, 202, 718, 2600, 9748, 37270, 146058, 582548, 2367028, 9761890, 40844168, 173001018, 741193056, 3207480526, 14008373662, 61683982696, 273658651700, 1222314257450, 5493414465900, 24828463984518 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

FORMULA

EXPCONV of A090344 with itself, i.e. a(n) = sum_{k=0}^n binomial(n,k)*A090344(k)*A090344(n-k)

CROSSREFS

Cf. A090344.

Sequence in context: A002527 A005566 A005631 * A150043 A048117 A048118

Adjacent sequences:  A118674 A118675 A118676 * A118678 A118679 A118680

KEYWORD

nonn

AUTHOR

Max Alekseyev, May 19 2006

STATUS

approved

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Last modified November 15 14:06 EST 2019. Contains 329149 sequences. (Running on oeis4.)