Area of n-th triple of squares around a triangle.

Terms

a(0) =1a(1) =3a(2) =16a(3) =75a(4) =361a(5) =1728a(6) =8281a(7) =39675a(8) =190096a(9) =910803a(10) =4363921a(11) =20908800a(12) =100180081a(13) =479991603a(14) =2299777936a(15) =11018898075a(16) =52794712441a(17) =252954664128