38455

Appears in sequences

• a(n) = (-1)^(n+1)*Sum_{k=0..n+1}(-1)^k*binomial(2*k,k).at n=8A054108
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 1), (1, -1, 1), (1, 0, 0), (1, 0, 1), (1, 1, -1)}.at n=8A150519
• Number of compositions (p0, p1, p2, ...) of n with pi - p0 <= i and pi >= p0.at n=18A177510
• G.f. satisfies: A(x) = 1 + Sum_{n>=1} x^n * A(x)^A026255(n).at n=9A193621
• a(n) = a(n-1) + a(n-2) + 2 a(ceiling(n/2)), where a(0) = 1, a(1) = 1, a(2) = 1.at n=19A298350