193710245

Appears in sequences

• a(n) = (3^n + 1)/2.at n=18A007051
• a(n) = 2*a(n-1) + 3*a(n-2), a(0) = a(1) = 1.at n=18A046717
• Number of periodic palindromic structures of length n using a maximum of three different symbols.at n=37A056504
• Binomial transform of Jacobsthal gap sequence (A080924).at n=18A080925
• a(n) = (3^(2*n) + 1) / 2.at n=9A083884
• a(n) = 3*a(n-1) + a(n-2) - 3*a(n-3).at n=18A103425
• Number of set partitions with at most 3 blocks; number of Dyck paths of height at most 4; dimension of space of symmetric polynomials in 3 noncommuting variables.at n=19A124302
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,5,13,40.at n=17A133448
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=17A133453
• a(n) = (3*3^n-(-1)^n)/2.at n=17A164907
• a(n) = (3^n+1)/(3-(-1)^n).at n=18A167205
• a(n) = ceiling(n^n/2).at n=9A168658
• a(n) = ((2*n + 1)^6 + 1)/2.at n=13A175113
• Number of compositions of even numbers into 9 parts <= n.at n=8A191496
• Permutation of natural numbers: a(n) = A048673(A122111(n)).at n=60A243506
• a(1) = 1, then A007051 ((3^n)+1)/2 interleaved with A057198 (5*3^(n-1)+1)/2.at n=35A246360