1768900

Appears in sequences

• Squares of tetrahedral numbers: a(n) = binomial(n+3,n)^2.at n=18A001249
• Squares of even tetrahedral numbers (A015220).at n=14A014796
• McKay-Thompson series of class 20B for Monster.at n=43A058551
• Numbers with prime factorization p^2*q^2*r^2*s^2 where p, q, r, and s are distinct primes.at n=26A190377
• Squares equal to the difference between two successive primes of the form n^2+1.at n=28A216330
• a(n) is the number of subsets of {1..n} that contain 3 even and 3 odd numbers.at n=42A331574