5230176602

Appears in sequences

• a(n) = (3^n + 1)/2.at n=21A007051
• 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=22A124302
• a(n) = 3*a(n-1) - a(n-3) + 3*a(n-4), with initial values 1,4,14,41.at n=20A132357
• a(0) = 1 and a(n) = (3^n - (-1)^n)/2 for n >= 1.at n=21A152011
• a(n) = (3*9^n + 1)/2.at n=10A199560
• a(n) = (-1)^(n+1) * (3^n+1)/2.at n=21A341463