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%I #15 May 30 2022 08:24:51
%S 2,7,39,236,1479,9418,60492,390720,2534115,16489802,107594725,
%T 703681448,4611414244,30273029080,199045400424
%N T(2n-1,n) where T is the array in A054126.
%F a(n) = A052509(4*n-2,3*n) + A052509(4*n-2,n-1) = 2^(n-2) + Sum_{m=0..n-1} binomial(3*n-1,m) for n >= 2. - _Jianing Song_, May 30 2022
%o (PARI) a(n) = if(n==1, 2, 2^(n-2) + sum(m=0, n-1, binomial(3*n-1, m))) \\ _Jianing Song_, May 30 2022
%Y Cf. A054126.
%K nonn,more
%O 1,1
%A _Clark Kimberling_
%E Definition clarified by _Eric Rowland_, May 29 2022
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