Problem 42800. house of cards

How many cards do one need to build a house of cards with n stages? Short explanation:

/\      2 cards for 1 stage

 /_\    7 cards for 2 stages
/\ /\

....

Solve

Last Solution submitted on Aug 22, 2024

Jan Orwat on 15 Apr 2016

@Thomas, the Test Suite is broken. Please provide "x" or replace it with "n" in tests.

Thomas Bischoff on 15 Apr 2016

Sorry for mistake! You are right! thanks

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