Tetrahedral-sided isosceles Heron triangle pairs.

Terms

a(0) =0a(1) =10a(2) =48a(3) =190a(4) =720a(5) =2698a(6) =10080a(7) =37630a(8) =140448a(9) =524170a(10) =1956240a(11) =7300798a(12) =27246960a(13) =101687050a(14) =379501248a(15) =1416317950a(16) =5285770560a(17) =19726764298a(18) =73621286640a(19) =274758382270