43682

Appears in sequences

• Essentially n-ary operations in Kleene free algebra.at n=3A007157
• Expansion of 1/((1-x)*(1-2*x)*(1-x^2)).at n=14A011377
• Numbers k such that k-th and (k+1)-st term of A038593 differ by 5.at n=22A038636
• Generalized Jacobsthal numbers.at n=16A083579
• Number of non-intersecting cycle systems in a particular directed graph.at n=9A112832
• Triangle T(n,k) read by rows: T(n,k) = 1 if k=1 or k=n, otherwise T(n,k) = (3*n-3*k+1)*T(n-1,k-1) + (3*k-2)*T(n-1,k).at n=37A142458
• Triangle T(n,k) read by rows: T(n,k) = 1 if k=1 or k=n, otherwise T(n,k) = (3*n-3*k+1)*T(n-1,k-1) + (3*k-2)*T(n-1,k).at n=43A142458
• a(n) = 2*(4^n - 1)/3 - n.at n=7A144414
• Triangle T(n,m) = 2*A022168(n,m) - binomial(n, m), 0 <= m <= n, read by rows.at n=37A174528
• Partial sums of floor(2^n/3).at n=15A178420
• Number of tatami tilings of a 4 X n grid (with monomers allowed).at n=14A192090
• Values of n such that A080221(n)=6; i.e., values of n such that n is divisible by the sum of digits of n when expressed in exactly 6 of the bases b=1...n.at n=34A271311
• Numbers k such that the total number of consecutive runs of zeros of length m in every binary expansion from 1 to k, is even, for all m != floor(log_2(k)).at n=42A360320