Square pyramidal numbers: a(n) = 0^2 + 1^2 + 2^2 + ... + n^2 = n*(n+1)*(2*n+1)/6.

Terms

a(0) =0a(1) =1a(2) =5a(3) =14a(4) =30a(5) =55a(6) =91a(7) =140a(8) =204a(9) =285a(10) =385a(11) =506a(12) =650a(13) =819a(14) =1015a(15) =1240a(16) =1496a(17) =1785a(18) =2109a(19) =2470a(20) =2870a(21) =3311a(22) =3795a(23) =4324a(24) =4900a(25) =5525a(26) =6201a(27) =6930a(28) =7714a(29) =8555