321300

Appears in sequences

• a(n) = 5*(n+1)*binomial(n+4,5)/2.at n=13A027801
• Lower triangular array called S1hat(5) related to partition number array A144890.at n=29A144891
• Second column (m=2) of triangle A144891 (S1hat(5)).at n=6A144893
• Numbers with prime factorization pqr^2s^2t^3.at n=13A190386
• Let h(m) denote the sequence whose n-th term is Sum__{k=0..n} (k+1)^m*T(n,k)^2, where T(n,k) is the Catalan triangle A039598. This is h(5).at n=4A228331
• Least m>0 for which m*n^2 + 1 is a square and m*triangular(n) + 1 is a triangular number (A000217). Or -1 if no such m exists.at n=6A267077