60686

Appears in sequences

• Triangle read by rows: T(n,k) is the number of skew Dyck paths of semilength n and having k UDL's (n >= 0; 0 <= k <= floor((n+1)/2)).at n=25A128728
• Number of skew Dyck paths of semilength n with no UDL's.at n=10A128729
• Number of n-length words w over a 7-ary alphabet such that w is empty or a prefix z concatenated with letter a_i and i=1 or 0 < #(z,a_{i-1}) >= #(z,a_i), where #(z,a_i) counts the occurrences of the i-th letter in z.at n=10A240613
• G.f. satisfies: A(x)^2 = A( x^2/(1 - 4*x + 2*x^2) ).at n=9A274484
• a(n) = 2*n*Fibonacci(n-2) + (-1)^n + 1.at n=17A309874
• Triangle read by rows: T(n, k) = C(n, k)*Sum_{j=0..n} C(n, k-j)*C(n+j, j)/C(2*j, j).at n=41A339000