Fn = Fn-1 + Fn-2
And F0 = F1 = 1
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How to answer with formula
Good Question! After 6 years of math classes in college, and 30+ years of teaching (during which I took many summer classes) I've never seen an explicit formula for the nth term of the Fibonacci sequence. Study more math and maybe you can discover the explicit formula that you want.
The nth hexagonal number is given by the formula: hn = 2n * (2n - 1) / 2
Formula for nth termTn = a + (4n - 1) {where a is the first term and n is natural number}
The nth triangular number is 0.5*n*(n+1)