EXPCONV of squares A000290 with themselves.

Terms

a(0) =1a(1) =8a(2) =50a(3) =248a(4) =1048a(5) =3952a(6) =13696a(7) =44480a(8) =137216a(9) =406016a(10) =1160704a(11) =3223552a(12) =8734720a(13) =23171072a(14) =60342272a(15) =154615808a(16) =390529024a(17) =973864960a(18) =2400845824a(19) =5857869824a(20) =14159446016a(21) =33935065088a(22) =80698408960a(23) =190534647808a(24) =446911479808