270400

Appears in sequences

• Triangle, read by rows, where T(n,k) = A049020([n/2],k)*A049020([(n+1)/2],k).at n=45A124526
• a(n) = P(n)^3 - P(n)^2 where P(n) = A000931(n).at n=21A133039
• Numbers with prime factorization p^2*q^2*r^6 where p, q, and r are distinct primes.at n=10A190469
• Number of 5Xn 0..1 arrays avoiding 0 0 0 and 0 1 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=7A207602
• Number of (w,x,y,z) with all terms in {1,...,n} and w<=2x and y<=2z.at n=26A212506
• Squares equal to the difference between two successive primes of the form n^2+1.at n=16A216330
• Number of (n+1)X(7+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal.at n=3A232514
• Number of (4+1)X(n+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, diagonally or antidiagonally, with no adjacent elements equal.at n=6A232519
• Array read by antidiagonals: T(n,m) = 2^n*(1+2^n)^m; n,m >= 0.at n=42A264872
• a(n) = [x^n] Product_{k>=1} (1 + 2^n*x^k).at n=6A292414
• a(n) is the smallest number k >= 1 that has exactly n divisors in A020487.at n=30A368215
• Triangle read by rows: T(n, k) = 2^k * hypergeom([-n, -k], [], 1/2).at n=42A375854
• Triangle of generalized Stirling numbers of the lower level of the hierarchy (case m=2).at n=21A377058