20764

Appears in sequences

• Number of ordered quadruples of integers from [ 1,n ] with no common factors between pairs.at n=45A015636
• a(n) = 2^n mod Fibonacci(n).at n=22A057862
• Intrinsic 10-palindromes: n is an intrinsic k-palindrome if it is a k-digit palindrome in some base.at n=20A060947
• Binomial transform of a fractal structured sequence.at n=13A106496
• Potential magic constants of a 10 X 10 magic square composed of consecutive primes.at n=27A192087
• a(n) = n*(5n^2 + 3n + 4) / 6.at n=29A203551
• Expansion of x^5*(1 - x)^2*(4 - 14*x + 8*x^2 + 11*x^3 - 6*x^4 - 2*x^5 + 2*x^6 + 5*x^7 - 2*x^8 + x^9)/(1 - 2*x)^4.at n=15A212330
• Number of partitions of n such that either both floor(n/2) and ceiling(n/2) are parts or else neither is a part.at n=36A238624
• Number of nX6 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.at n=2A240283
• T(n,k)=Number of nXk 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.at n=30A240284
• Number of 3Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or two plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4.at n=5A240286
• Number of length 4+2 0..n arrays with every three consecutive terms having the sum of some two elements equal to twice the third.at n=36A248437
• Number of length 2+2 0..n arrays with the sum of the maximum minus twice the median plus the minimum of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=18A251429
• a(n) = 2*(3*n+1)*(9*n+8).at n=19A304506
• Number of series-reduced locally disjoint rooted trees with n leaves spanning an initial interval of positive integers.at n=5A319291
• Number of free treelike midpoint-free polycubes of size n, identifying rotations and reflections.at n=16A368031