Squares of even square pyramidal numbers.

Terms

a(0) =196a(1) =900a(2) =19600a(3) =41616a(4) =256036a(5) =422500a(6) =1537600a(7) =2238016a(8) =6100900a(9) =8236900a(10) =18696976a(11) =24010000a(12) =48024900a(13) =59505796a(14) =108493056a(15) =130873600a(16) =222308100a(17) =262634436a(18) =421891600a(19) =490179600a(20) =752624356a(21) =862596900a(22) =1275918400a(23) =1445824576a(24) =2072616676a(25) =2326132900a(26) =3246720400