27304196
domain: N
Appears in sequences
- a(n) = 6*a(n-1) - a(n-2) + 2 with a(0) = 0, a(1) = 3.at n=10A001652
- Expansion of 4*x/((1+x)*(1-6*x+x^2)).at n=10A046729
- Expansion of 1/((1 - x)*(1 - 2*x - x^2)).at n=19A048739
- Number of 20 X n binary arrays with path of adjacent 1's from upper right corner to lower left corner.at n=1A069342
- Duplicate of A046729.at n=10A089498
- Expansion of g.f. (1-x-x^2)/(1-x-3*x^2-x^3).at n=21A097075
- 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=19A111587
- Pythagorean triples of nearly isosceles triangle.at n=27A114336
- Row sums of A181657.at n=38A181658
- Numbers k where d/k reaches a new record, with d the distance from the k-th triangular number to the nearest square.at n=27A229117
- Pairs of integers (a,b) such a^2 + (a+1)^2 = b^2.at n=20A261116