a(n) = sum of squares of first n positive integers congruent to 1 mod 4.

Terms

a(0) =1a(1) =26a(2) =107a(3) =276a(4) =565a(5) =1006a(6) =1631a(7) =2472a(8) =3561a(9) =4930a(10) =6611a(11) =8636a(12) =11037a(13) =13846a(14) =17095a(15) =20816a(16) =25041a(17) =29802a(18) =35131a(19) =41060a(20) =47621a(21) =54846a(22) =62767a(23) =71416a(24) =80825a(25) =91026a(26) =102051a(27) =113932a(28) =126701a(29) =140390