64570082

Appears in sequences

• a(n) = (3^n + 1)/2.at n=17A007051
• Number of periodic palindromic structures of length n using a maximum of three different symbols.at n=35A056504
• 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=18A124302
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,4,14,41.at n=16A132357
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 2,4,13,40.at n=16A133453
• a(0) = 1 and a(n) = (3^n - (-1)^n)/2 for n >= 1.at n=17A152011
• a(n) = (3*9^n + 1)/2.at n=8A199560
• Permutation of natural numbers: a(n) = A048673(A122111(n)).at n=58A243506
• a(1) = 1, then A007051 ((3^n)+1)/2 interleaved with A057198 (5*3^(n-1)+1)/2.at n=33A246360
• a(n) = (-1)^(n+1) * (3^n+1)/2.at n=17A341463