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%I #13 Jan 26 2020 17:55:27
%S 1,1,1,2,1,1,4,2,2,1,9,4,5,2,1,21,9,12,5,3,1,51,21,30,12,9,3,1,127,51,
%T 76,30,25,9,4,1,323,127,196,76,69,25,14,4,1,835,323,512,196,189,69,44,
%U 14,5,1,2188,835,1353,512,518,189,133,44,20,5,1,5798,2188,3610,1353
%N Triangle T(n,k) (n >= 0, 0 <= k <= n) generalizing Motzkin numbers.
%C This triangle appears on page 9 of the linked reference and is defined by Corollary 2.4.
%C A number triangle with repeated columns of A064189. Production matrix is A070909 (without first term). - _Philippe Deléham_, Dec 02 2009
%H J. L. Arregui, <a href="http://arXiv.org/abs/math.NT/0109108">Tangent and Bernoulli numbers</a> related to Motzkin and Catalan numbers by means of numerical triangles.
%F T(n, 0) = Sum_{k=0..n-1} T(n-1, k). For k even, 0 < k <= n, T(n, k) = Sum_{j=k-1..n-1} T(n-1, j). For k odd, 0 < k <= n, T(n, k) = T(n-1, k-1). - _David Wasserman_, Jul 15 2002
%e Triangle begins
%e 1;
%e 1, 1;
%e 2, 1, 1;
%e 4, 2, 2, 1; ...
%Y First column gives A001006.
%K nonn,tabl,easy
%O 0,4
%A _N. J. A. Sloane_, Sep 21 2001
%E More terms from _David Wasserman_, Jul 15 2002
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