Rounded area of squares and pentagons which arrange as successively circumscribing.

Terms

a(0) =1a(1) =2a(2) =2a(3) =4a(4) =5a(5) =8a(6) =13a(7) =19a(8) =29a(9) =45a(10) =68a(11) =105a(12) =159a(13) =243a(14) =370a(15) =567a(16) =862a(17) =1319a(18) =2007a(19) =3071a(20) =4673a(21) =7148a(22) =10877a(23) =16640a(24) =25320a(25) =38735a(26) =58942a(27) =90169a(28) =137209a(29) =209901