204700

Appears in sequences

• Expansion of g.f.: 1/((1 - 2*x^2 + x^4 + 2*x^6 - x^8)*(1 - 2*x^2 - x^4 + 2*x^6 - x^8)).at n=30A147607
• a(n) = n*(n + 1)*(n + 2)*(4*n - 3)/6.at n=23A264851