Sum of the areas of the first n+1 Pell triangles.

Terms

a(0) =0a(1) =1a(2) =6a(3) =36a(4) =210a(5) =1225a(6) =7140a(7) =41616a(8) =242556a(9) =1413721a(10) =8239770a(11) =48024900a(12) =279909630a(13) =1631432881a(14) =9508687656a(15) =55420693056a(16) =323015470680