36696

Appears in sequences

• Number of permutations of length n without 3-sequences.at n=8A002628
• Triangle of numbers a(n,k) = number of permutations on n letters containing k 3-sequences (n >= 0, 0<=k<=max(0,n-2)).at n=23A047921
• Number of cycles for the map LL:x->x^2-2 acting on Z/(2^n-1).at n=30A128976
• E.g.f.: A(x) = exp( Sum_{n>=1} n^2 * a(n-1)*x^n/n! ) = Sum_{n>=0} a(n)*x^n/n! with a(0) = 1.at n=5A156326
• a(n) = 1728*n - 1320.at n=21A157263