430257

Appears in sequences

• a(n) = Sum_{k=0..n} S(k), where S(n) are the tribonacci generalized numbers A001644.at n=20A073728
• a(n) = (1/4) * Sum_{k=0..n} (k+2) * binomial(2*k+2,2*n-2*k+1).at n=12A391829