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r = √3
sn = a(rⁿ -1) / (r - 1)
s15 = (1 (√3)¹⁵ - 1 ) / (√3 -1 )
= (√3¹⁵ - 1)(√3 +1) /(√3 - 1)(√3 +1)
= (√3¹⁶ - √3¹⁵ - √3 - 1)/ ( 3-1)
= (3⁸ - 3⁷√3 - √3 - 1 )/ (2)
= ¹/₂ (6.561 - 2.188 √ 3 - 1)