Both sum of n+1 consecutive squares and sum of the immediately following n consecutive squares.

Terms

a(0) =0a(1) =25a(2) =365a(3) =2030a(4) =7230a(5) =19855a(6) =45955a(7) =94220a(8) =176460a(9) =308085a(10) =508585a(11) =802010a(12) =1217450a(13) =1789515a(14) =2558815a(15) =3572440a(16) =4884440a(17) =6556305a(18) =8657445a(19) =11265670a(20) =14467670a(21) =18359495a(22) =23047035a(23) =28646500a(24) =35284900a(25) =43100525a(26) =52243425a(27) =62875890a(28) =75172930a(29) =89322755