23474025

Appears in sequences

• Squares of numbers in array formed from odd elements to the right of middle of rows of Pascal triangle that are not 1.at n=30A014760
• Squares of odd pentagonal numbers.at n=28A014769
• a(n) = binomial(n+4, n)^2. Square of the fifth diagonal sequence of A007318 (Pascal). Fifth diagonal sequence of A008459.at n=16A288876
• a(n) is the number of subsets of {1..n} that contain 4 even and 4 odd numbers.at n=40A331575
• Odd numbers k such that sigma(k) > 2*k and A003415(sigma(k)) < k, where A003415 is the arithmetic derivative, and sigma is the sum of divisors function.at n=14A347890