40576

Appears in sequences

• a(n) = n! + 2^n.at n=8A007611
• Theta series of 8-dimensional strongly 6-modular lattice O(6) with minimal norm 3.at n=42A029720
• Number of plane binary trees of size n+3 and height n.at n=9A073774
• a(n) = 2^n + 6^n + 8^n.at n=5A074542
• 30*a(n) is the gap between sexy prime triples in the n-th sexy prime triple triple whose initial term is 17.at n=20A090891
• Number of n X n binary arrays, symmetric about both diagonal and antidiagonal, with every 1 adjacent to at least one other 1, but at most one 1 adjacent horizontally and at most one 1 adjacent vertically.at n=8A144056
• Number of 2 X 2 matrices having all terms in {-n,...,0,..,n} and positive determinant.at n=7A211148
• Poincaré series for hyperbolic reflection group with Coxeter diagram shown in Comments.at n=19A265050
• Number T(n,k) of binary search trees of height k having n internal nodes; triangle T(n,k), n>=0, max(0,floor(log_2(n))+1)<=k<=n, read by rows.at n=50A335919
• Expansion of 1/(1 - x/(1-9*x)^(2/3)).at n=6A362210
• Expansion of 1/(1 - x/(1 - 9*x^2)^(1/3)).at n=12A371456