19756

Appears in sequences

• Let u(1)=u(2)=1, u(3)=2n, u(k) = abs(u(k-1)-u(k-2)-u(k-3)) and M(k) = Max_{i<=i<=k} u(i), then for any k >= A078109(n), M(k) = floor(sqrt(k + a(n))).at n=22A078108
• a(n) = 1331*n - 209.at n=14A157444
• n*(n+1)*(15*n^2-n-8)/12.at n=11A172047
• Smallest k such that the number of composites of the form a^2 + 1 between two successive primes of this form equals 2n-1.at n=47A208132
• Number of 2 X 2 matrices having all terms in {-n,...,0,...,n} and determinant > n.at n=6A211151
• Number of partitions of n whose different summands alternate in parity.at n=46A242110
• Number of generalized cycle-up-down permutations of [n].at n=8A249395
• Numbers n such that Bernoulli number B_{n} has denominator 690.at n=32A272186
• Number of partitions of n that contain at least one composite part.at n=37A353188
• a(n) = a(n-1) + 3*a(n-2) + 9*a(n-3) with a(0)=0, a(1)=1, a(2)=4.at n=10A366314