111848107

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2), a(0)=2, a(1)=3.at n=26A048573
• a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) for n>3.at n=27A136336
• a(n) = 3*a(n-1) - 4*a(n-2) + 6*a(n-3) - 4*a(n-4), with initial terms 1,2,4,7.at n=27A136408
• a(n) = (5*4^n + 1)/3.at n=13A136412
• a(n) = (10*2^n + 3 - (-1)^n)/6.at n=26A171231
• a(n) = (1 + 2^n*(3 + 2*(-1)^n))/3.at n=26A255138
• Number of achiral color patterns (set partitions) in a row or cycle of length n with 4 or fewer colors (subsets).at n=28A305750