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Central terms of the triangle in A199333: a(n) = A199333(2*n,n).
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%I #12 Apr 05 2023 08:13:30

%S 1,2,7,29,107,431,1619,6079,22937,87083,332393,1273541,4896103,

%T 18877711,72968563,282664351,1097088989,4265342057,16608401041,

%U 64758466127,252814859149,988089813541,3865761355523,15138431958437,59333638261529,232737382916429

%N Central terms of the triangle in A199333: a(n) = A199333(2*n,n).

%C a(n) = A199582(2*n).

%H Reinhard Zumkeller, <a href="/A199581/b199581.txt">Table of n, a(n) for n = 0..75</a>

%o (Haskell)

%o a199581 n = a199333_row (2*n) !! n

%Y Cf. A000984, A199333, A199582.

%K nonn

%O 0,2

%A _Reinhard Zumkeller_, Nov 09 2011