20950

Appears in sequences

• Number of ways to write n as the root-mean-square (RMS) of a set of distinct odd integers.at n=27A211868
• Number of (n+2)X(1+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=7A252150
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=28A252157
• T(n,k)=Number of (n+2)X(k+2) 0..3 arrays with every 3X3 subblock row and column sum not equal to 0 1 3 6 or 7 and every 3X3 diagonal and antidiagonal sum equal to 0 1 3 6 or 7.at n=35A252157
• Number of n X 1 0..3 arrays with every repeated value in every row unequal to the previous repeated value, and in every column equal to the previous repeated value, and new values introduced in row-major sequential order.at n=9A268419
• Solution of the complementary equation a(n) = a(n-1) + a(n-2) + b(n-1) + b(n-2) + 1, where a(0) = 1, a(1) = 3, b(0) = 2, b(1) = 4.at n=16A294415
• Approximation of the 3-adic integer exp(-3) up to 3^n.at n=10A309901
• Approximation of the 3-adic integer exp(-3) up to 3^n.at n=11A309901
• Numbers k such that k and k+1 are both divisible by the total binary weight of their divisors (A093653).at n=10A338514
• Number of integer partitions of n that contain at least one even part and whose halved even parts are relatively prime.at n=38A366845
• E.g.f. satisfies A(x) = 1/(1 + log(1 - x*A(x)^2))^2.at n=4A377427