Even positive numbers that are one less than the square of a perfect power.

Terms

a(0) =80a(1) =624a(2) =728a(3) =2400a(4) =6560a(5) =14640a(6) =15624a(7) =28560a(8) =50624a(9) =59048a(10) =83520a(11) =117648a(12) =130320a(13) =194480a(14) =279840a(15) =390624a(16) =531440a(17) =707280a(18) =923520a(19) =1185920a(20) =1500624a(21) =1771560a(22) =1874160a(23) =2313440a(24) =2825760a(25) =3418800a(26) =4100624a(27) =4782968a(28) =4826808a(29) =4879680