109227

Appears in sequences

• a(n) = a(n-1) + 2*a(n-2), a(0)=2, a(1)=3.at n=16A048573
• 2nd row of Family 1 "90 X 150 array": generations 0 .. n of Rule 90 starting from seed pattern 7.at n=7A048711
• a(n) = smallest number greater than a(n-1) having a largest proper divisor that is greater than and coprime to a(n-1); a(1) = 1.at n=44A098144
• Modulo 2 binomial transform of the Jacobsthal numbers J(n).at n=18A100745
• Numbers n such that A003313(3n) < A003313(n).at n=20A104699
• Numbers k such that A003313(k) = A003313(6*k).at n=20A116461
• Decimal representation of n-th iteration of the Rule 94 elementary cellular automaton starting with a single ON cell.at n=8A118101
• a(n) = a(n-1) + 4*a(n-2) - 4*a(n-3) for n>3.at n=17A136336
• 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=17A136408
• a(n) = (5*4^n + 1)/3.at n=8A136412
• Locations of row maxima in "crushed" version of Stern's diatomic array.at n=31A169969
• a(n) = (10*2^n + 3 - (-1)^n)/6.at n=16A171231
• a(n) = n*2^(n+1) + (2^(n+3)+(-1)^n)/3.at n=12A191007
• Dispersion of A004767 (4k+3, k>=0), by antidiagonals.at n=46A191669
• Indices of the pentagonal numbers listed in A209049.at n=19A209048
• A249183 seen as binary numbers.at n=8A249184
• a(n) = (1 + 2^n*(3 + 2*(-1)^n))/3.at n=16A255138
• Number of achiral color patterns (set partitions) in a row or cycle of length n with 4 or fewer colors (subsets).at n=18A305750
• Expansion of (2 + 6*x + 3*x^2 +4*x^3 - 10*x^4)/(1 - x - 4*x^4 + 4*x^5).at n=32A309792
• Numbers which can written in exactly four ways as a sum of two distinct nonzero pentagonal numbers.at n=24A333014