370880

Appears in sequences

• G.f. satisfies: A(x) = x + A( x^2 + x^2*A(x) ).at n=20A211180
• Numbers k such that k and k+1 are both half-Zumkeller numbers (A246198).at n=28A331371
• Irregular table read by rows: T(n,k) is the number of k-gons, k>=3, formed inside a right triangle by the straight line segments mutually connecting all vertices and points on the two shorter edges whose positions equal the Farey series of order n.at n=40A359971
• a(n) = [x^n] Product_{k=0..n-1} (1 + k*x)^4.at n=5A384029