18267

Appears in sequences

• Numbers n such that 8*10^n + 4*R_n - 1 is prime, where R_n = 11...1 is the repunit (A002275) of length n.at n=18A103080
• Matrix inverse of triangle A122176, where A122176(n,k) = C( k*(k+1)/2 + n-k + 1, n-k) for n>=k>=0.at n=40A121436
• G.f.: A(q) = exp( Sum_{n>=1} A162552(n) * 3*A038500(n) * q^n/n ).at n=26A161808
• a(n) is the number of distinct billiard words with length n on an alphabet of 3 symbols.at n=12A180238
• Number of 0..n arrays x(0..10) of 11 elements with zero 6th differences.at n=31A200447
• Partial sums of the number of active (ON, black) cells in n-th stage of growth of two-dimensional cellular automaton defined by "Rule 334", based on the 5-celled von Neumann neighborhood.at n=40A271283
• Matula-Goebel numbers of semi-lone-child-avoiding rooted identity trees.at n=43A331963
• G.f. satisfies A(x) = 1 + x*A(x)^3 / (1 - x*A(x))^3.at n=6A367233