42578

Appears in sequences

• Sum{T(n-k,k)}, 0<=k<=[ n/2 ], T given by A026681.at n=20A026691
• Expansion of g.f. x*(x-1)*(x+1)^3/((2*x^3+x^2-1)*(x^4+1)).at n=28A107853
• a(n) is the number of terms in the expansion of (x-y)*(x^4-y^4)*(x^9-y^9)*...*(x^(n^2)-y^(n^2)).at n=49A225549