50941

Appears in sequences

• a(n) = n plus sum of previous three terms.at n=17A062544
• E.g.f.: S(x,q) = Integral C(x,q) * C(q*x,q) dx, such that C(x,q)^2 - S(x,q)^2 = 1, where S(x,q) = Sum_{n>=0} sum_{k=0..n*(n+1)/2} T(n,k)*x^n*y^k/n!, as an irregular triangle of coefficients T(n,k) read by rows.at n=29A322219
• Number of tilings of a 3 X n rectangle using V (2m+1)-ominoes (m >= 0) in standard orientation.at n=13A322496