22369620

Appears in sequences

• Barlow packings with group R3(bar)m(SO) that repeat after 6n+3 layers.at n=25A011954
• a(n) = a(n-1) + 2*a(n-2) + 2, for n>=3, where a(0)= 1, a(1)= 2, a(2)= 4.at n=24A026644
• a(n) = Sum_{j=1..n} phi(n)^j.at n=11A075490
• Partial sums of Jacobsthal gap sequence.at n=24A080610
• a(n) = (4/3)*(4^n - 1).at n=12A080674
• a(n) = -5*a(n-1) - 4*a(n-2), a(0)=1, a(1)=0.at n=13A084240
• Expansion of x*(1+2*x)/((1+x)*(1-x)*(1-2*x)).at n=24A084639
• Binomial transform of (-1)^mod(n,3) (A257075).at n=26A086953
• Expansion of (1+x-4*x^2) / ((1+x)*(1-4*x^2)).at n=25A087213
• Expansion of (1 - 2*x + 2*x^2)/((1 - x^2)*(1 - 2*x)).at n=25A097072
• Expansion of (1-x+2*x^2)/((1+x)*(1-2*x)).at n=25A097073
• Expansion of (1+3x)/((1-x)(1-4x^2)).at n=23A097164
• Expansion of x^3 / ((x-1)*(2*x-1)*(x^2-x+1)).at n=26A111927
• Expansion of -2*x*(-3-2*x+4*x^2) / ((x-1)*(2*x+1)*(2*x-1)*(1+x)).at n=24A120462
• Binomial transform of A101000.at n=24A130624
• a(n) = 3a(n-1) - 3a(n-2) + 2a(n-3), a(0) = 3, a(1) = 2, a(2) = 0.at n=26A131370
• a(1)=1, a(n) = a(n-1) + (p-1)*p^(n/2-1) if n is even, else a(n) = a(n-1) + p^((n-1)/2), where p=4.at n=23A133628
• Second differences of Jacobsthal sequence A001045, pairs with even and odd indices swapped.at n=27A140505
• a(n) = (2^n + 2*(-1)^n - 6)/3.at n=26A153772
• Duplicate of A080674.at n=11A155721