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\$\begingroup\$ Oh god. It took me much longer than it should have to realize why you were "commenting out" that 20 on the second line :P \$\endgroup\$

Theo
– Theo

2017-01-04 13:14:45 +00:00
Commented Jan 4, 2017 at 13:14
\$\begingroup\$ @xnor, Any reference to this magic formula? \$\endgroup\$

TheChetan
– TheChetan

2017-01-04 13:43:21 +00:00
Commented Jan 4, 2017 at 13:43
\$\begingroup\$ @TheChetan: possibly a(n) = (-10 + (5-3*sqrt(5))*(2-sqrt(5))^n + (2+sqrt(5))^n*(5+3*sqrt(5)))/20 (Colin Barker, Nov 26 2016) from the OEIS page \$\endgroup\$

Titus
– Titus

2017-01-04 13:50:20 +00:00
Commented Jan 4, 2017 at 13:50
\$\begingroup\$ @TheChetan bit late, but it's Binet's formula \$\endgroup\$

DividedByZero
– DividedByZero

2022-11-06 14:16:13 +00:00
Commented Nov 6, 2022 at 14:16

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