6990507

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2), a(0)=2, a(1)=3.at n=22A048573
• Numbers k such that A003313(k) = A003313(9*k).at n=27A116463
• a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) for n>3.at n=23A136336
• 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=23A136408
• a(n) = (5*4^n + 1)/3.at n=11A136412
• a(n) = (10*2^n + 3 - (-1)^n)/6.at n=22A171231
• a(n) = (1 + 2^n*(3 + 2*(-1)^n))/3.at n=22A255138
• Number of achiral color patterns (set partitions) in a row or cycle of length n with 4 or fewer colors (subsets).at n=24A305750
• Expansion of (2 + 6*x + 3*x^2 +4*x^3 - 10*x^4)/(1 - x - 4*x^4 + 4*x^5).at n=44A309792