2863311531
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=33A001045
- a(2*n) = 2*a(2*n-1), a(2*n+1) = 2*a(2*n)-1.at n=33A005578
- a(n) = (2^(2^n + 1) + 1)/3.at n=4A006485
- a(n) = (2^(2*n + 1) + 1)/3.at n=16A007583
- Number of Barlow packings with group P3(bar)m1(SO) that repeat after 2n-1 layers.at n=33A011950
- a(n) = C(n,1) + C(n,4) + ... + C(n, 3*floor(n/3) + 1).at n=32A024494
- a(n) = C(n,2) + C(n,5) + ... + C(n, 3*floor(n/3)+2).at n=33A024495
- Positions of check bits in code in A075970.at n=4A075972
- Expansion of 1/((1-x)*(1+2*x)).at n=32A077925
- Generalized Jacobsthal sequence.at n=32A087629
- Pair reversal of Jacobsthal numbers.at n=32A092808
- Expansion of (1 - 2*x + 2*x^2)/((1 - x^2)*(1 - 2*x)).at n=32A097072
- Column 2 of the array in A107735.at n=31A107733
- Nonprime numbers of the form 1 + Sum_{k=1..m} 2^(2*k - 1).at n=6A127959
- Second differences of A130624.at n=31A130626
- Interlaces A007583 with A083420.at n=32A131588
- A024494 prefixed by a 0.at n=33A131708
- A trisection of A024495.at n=11A132805
- A024495 but with terms swapped in pairs.at n=32A135574
- First quadrisection of A139763 (1, 2, 3, 4, 11, ...).at n=8A139792