11453246123
domain: N
Appears in sequences
- Jacobsthal sequence (or Jacobsthal numbers): a(n) = a(n-1) + 2*a(n-2), with a(0) = 0, a(1) = 1; also a(n) = nearest integer to 2^n/3.at n=35A001045
- a(2*n) = 2*a(2*n-1), a(2*n+1) = 2*a(2*n)-1.at n=35A005578
- a(n) = (2^(2*n + 1) + 1)/3.at n=17A007583
- Number of Barlow packings with group P3(bar)m1(SO) that repeat after 2n-1 layers.at n=35A011950
- A Jacobsthal number sequence.at n=11A082365
- Generalized multiplicative Jacobsthal sequence.at n=35A087463
- Expansion of (1 - 2*x + 2*x^2)/((1 - x^2)*(1 - 2*x)).at n=34A097072
- Nonprime numbers of the form 1 + Sum_{k=1..m} 2^(2*k - 1).at n=7A127959
- Fourth quadrisection of Jacobsthal numbers A001045: a(n)=16a(n-1)-5.at n=8A141060
- The Jacobsthal sequence, dropping each third term.at n=23A141355
- a(n) = Product_{k=1..floor((n-1)/2)} (1 + 8*cos(k*Pi/n)^2) for n >= 0.at n=35A152046
- Interleave A007583 and A000012.at n=34A166752
- Decimal representation of the n-th iteration of the "Rule 92" elementary cellular automaton starting with a single ON (black) cell.at n=33A267052
- Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 678", based on the 5-celled von Neumann neighborhood.at n=33A283642
- a(n) = p(0,n), where p(x,n) is the strong divisibility sequence of polynomials based on sqrt(2) as in A327320.at n=34A329005
- a(n) = Sum_{k=0..n} binomial(2*n+1,3*k).at n=17A387868