11186176

Appears in sequences

• a(n) = 2^(n-1)*(2^n - (-1)^n)/3.at n=13A003683
• Expansion of e.g.f. sinh(log(1+tanh(x))).at n=13A009570
• Number of rational knots (or two-bridge knots) with n crossings (up to mirroring).at n=25A018240
• Duplicate of A018240.at n=25A090596
• a(n) = - a(n-1) + 5(a(n-2) + a(n-3)) - 2(a(n-4) + a(n-5)) - 8(a(n-6) + a(n-7)).at n=26A090597
• Starting a priori with the fraction 1/1, the denominators of fractions built according to the rule: add top and bottom to get the new bottom, add top and 9 times the bottom to get the new top.at n=11A110953
• (A192466)/2.at n=12A192467
• Expansion of Sum_{n>=0} (-4)^n * (2*4^n + 1)/3 * x^(n*(n+1)/2).at n=21A370018