27954

Appears in sequences

• Number of rooted genus-2 maps with n edges.at n=6A006301
• Number of ways of seating n people around a table for the second time without anyone sitting next to the same person as they did the first time.at n=9A089222
• L-th order palindromes with L > 2.at n=26A089381
• Number of line segments connecting exactly 4 points in an n x n grid of points.at n=29A177720
• G.f. satisfies: A(x) = Sum_{n>=0} x^n*A(x)^n / Product_{k=1..n} (1 - k*x).at n=8A225293
• Indices of primes in the tribonacci-like sequence, A214825.at n=30A230016
• Triangle T(n,k) read by rows: T(n,k) is the number of rooted genus-k maps with n edges, n>=0, 0<=k<=n.at n=23A238396
• Triangle read by rows: T(n,g) is the number of rooted maps with n edges on an orientable surface of genus g.at n=14A269919
• a(n) = 81*n^2 - 69*n + 24.at n=19A304616
• The number of ways of seating n people around a table for the second time so that k pairs are maintained. T(n,k) read by rows.at n=45A326390
• Expansion of Product_{k>=1} (Product_{j=1..k} 1/(1 - x^(k*j))^(k*j)).at n=16A327068
• Triangle read by rows: T(n,k) is the number of permutations of k elements from [1..n] in a circle where adjacent values cannot be consecutive modulo n, rotations are distinct.at n=54A338849
• Number of compositions (ordered partitions) of n into an odd number of cubes.at n=56A339421