76069501249
domain: N
Appears in sequences
- a(n)-th triangular number is a square: a(n+1) = 6*a(n) - a(n-1) + 2, with a(0) = 0, a(1) = 1.at n=15A001108
- Squares of NSW numbers (A002315): x^2 such that x^2 - 2y^2 = -1 for some y.at n=7A008843
- Expansion of 1/((1 - x)*(1 - 2*x - x^2)).at n=28A048739
- Repeatedly multiply (1,0,0) by ([1,2,2],[2,1,2],[2,2,3]); sequence gives leading entry.at n=15A090390
- Expansion of g.f. x/(1 - x - 3*x^2 - x^3).at n=30A097076
- 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=28A111587
- Consider all Pythagorean triples (X,X+1,Z) ordered by increasing Z; sequence gives Z-(X+1) values.at n=14A115598