61596

Appears in sequences

• Square array read by antidiagonals: T(n,k)=T(n,k-1)*n^2/(n-1)-Catalan(k-1) with a(n,1)=n-1 and a(1,k)=0 where Catalan(k)=C(2k,k)/(k+1)=A000108(k).at n=48A067346
• Expansion of (1+sqrt(1-4x))/(4sqrt(1-4x)-2).at n=7A104530
• Number of permutations of length n which avoid the patterns 1342, 3214, 4312.at n=12A116808
• Number of -2..2 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having three distinct values for every i<=n and j<=n.at n=12A211459
• a(n) = 81*n^2 - 69*n + 24.at n=28A304616
• Number of (binary) max-heaps on n elements from the set {0,1} containing exactly eight 0's.at n=26A326509
• For 1<=x<=n, 1<=y<=n, write gcd(x,y) = u*x+v*y with u,v minimal; a(n) = sum of the values of u^2+v^2.at n=35A345434