111888

Appears in sequences

• Theta series of A_8 lattice.at n=11A008448
• Theta series of direct sum of 4 copies of hexagonal lattice.at n=15A008655
• Number of distinct ways to place bishops (up to 2n-2) on an n X n chessboard so that no bishop is attacking another and that it is not possible to add another bishop.at n=6A146304
• O.g.f.: exp( Sum_{n>=1} (sigma(2*n)-sigma(n))^2/2 * x^n/n ).at n=14A193538
• List of words over {1,8} with equal numbers of 1's and 8's.at n=8A214531
• Numbers k such that the digits of k are in increasing order and k divides (reverse(k) * 10^m) for some sufficiently-large integer m.at n=20A260462
• Expansion of Product_{k>=0} 1/(1-x^(4*k+1))^3.at n=41A261632
• Numbers that are the concatenation of two palindromes and that have exactly two palindromic factors, all with the same number of decimal digits.at n=27A355148
• Number of unordered triples of self-avoiding paths with nodes that cover all vertices of a convex n-gon; one-node paths are allowed.at n=8A360021
• Triangle read by rows: T(n,k) is the number of sets of noncrossing paths of size k that cover n nodes arranged in a circle with one node paths allowed, 0 <= k <= n.at n=48A390894