4684660

Appears in sequences

• a(n) = floor( a(n-1)/(sqrt(2) - 1) ), with a(0) = 1.at n=18A024537
• Consider all Pythagorean triples (X,X+1,Z) ordered by increasing Z; sequence gives X+1 values.at n=9A046090
• Expansion of 4*x/((1+x)*(1-6*x+x^2)).at n=9A046729
• Expansion of (1-x)^(-1)/(1+2*x-x^2).at n=18A077921
• Duplicate of A046729.at n=9A089498
• Expansion of g.f. x/(1 - x - 3*x^2 - x^3).at n=19A097076
• a(n) = 2*a(n-1) + 2*a(n-3) + a(n-4), a(0) = 1, a(1) = 4, a(2) = 9, a(3) = 20.at n=17A111587
• Pythagorean triples of nearly isosceles triangle.at n=25A114336
• Binomial transform of 1,0,1,0,2,0,4,0,8,0,16,...at n=19A171842
• a(n) = 6*a(n-1) - a(n-2) - 2 with n>1, a(0)=0, a(1)=1.at n=10A182435