137904

Appears in sequences

• Duplicate of A024537.at n=13A018905
• a(n) = floor( a(n-1)/(sqrt(2) - 1) ), with a(0) = 1.at n=14A024537
• Consider all Pythagorean triples (X,X+1,Z) ordered by increasing Z; sequence gives X+1 values.at n=7A046090
• Expansion of 4*x/((1+x)*(1-6*x+x^2)).at n=7A046729
• Expansion of (1-x)^(-1)/(1+2*x-x^2).at n=14A077921
• Duplicate of A046729.at n=7A089498
• Expansion of g.f. x/(1 - x - 3*x^2 - x^3).at n=15A097076
• 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=13A111587
• Pythagorean triples of nearly isosceles triangle.at n=19A114336
• Binomial transform of 1,0,1,0,2,0,4,0,8,0,16,...at n=15A171842
• a(n) = 6*a(n-1) - a(n-2) - 2 with n>1, a(0)=0, a(1)=1.at n=8A182435
• Molecular topological indices of the complete bipartite graphs K_{n,n}.at n=25A192418
• Rectangular array read upwards by columns: T = T(n,k) = number of paths from (0,1) to (n,k), where 0 <= k <= 2, consisting of segments given by the vectors (1,1), (1,0), (1,-1).at n=45A247311
• Number of 2 X 2 matrices with entries in {0,1,...,n} and odd determinant with no entry repeated.at n=25A279483