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Number of Motzkin paths of length n in 3D with no level steps at odd level.
0

%I #3 Mar 30 2012 17:26:53

%S 1,2,6,18,60,202,718,2600,9748,37270,146058,582548,2367028,9761890,

%T 40844168,173001018,741193056,3207480526,14008373662,61683982696,

%U 273658651700,1222314257450,5493414465900,24828463984518

%N Number of Motzkin paths of length n in 3D with no level steps at odd level.

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

%Y Cf. A090344.

%K nonn

%O 0,2

%A _Max Alekseyev_, May 19 2006