40645

Appears in sequences

• 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, 0), (-1, 0, 1), (0, 0, -1), (0, 1, 0), (1, -1, 1)}.at n=10A148464
• Numbers k with squares that are concatenations k^2 = x//y such that x is an anagram of y.at n=10A162945
• G.f.: x^2*(x+1)^2/(x^3+x^2-1)^2.at n=30A228364
• a(n) = Sum(psi(k-1)*psi(n-k-1),k=0..n)+(1-(-1)^n)/2, where psi(k) = A000931(k+6).at n=28A285187