63140

Appears in sequences

• Triangle of coefficients of polynomials P(n; x) = Permanent(M), where M=[m(i,j)] is n X n matrix defined by m(i,j)=x if -1<=i-j<=1 else m(i,j)=1.at n=49A080018
• Second pentagonal numbers that are interprime.at n=23A205881
• Expansion of phi(x^2) * chi(x)^4 in powers of x where phi(), chi() are Ramanujan theta functions.at n=29A260515
• a(n) = n*(2*n+1)*binomial(n+2,n)/3.at n=20A289643