a(0)=0; then a(4*k+1)=a(4*k)+(4*k+1)^2, a(4*k+2)=a(4*k+1)+(4*k+3)^2, a(4*k+3)=a(4*k+2)+(4*k+2)^2, a(4*k+4)=a(4*k+3)+(4*k+4)^2.
A115391
a(0)=0; then a(4*k+1)=a(4*k)+(4*k+1)^2, a(4*k+2)=a(4*k+1)+(4*k+3)^2, a(4*k+3)=a(4*k+2)+(4*k+2)^2, a(4*k+4)=a(4*k+3)+(4*k+4)^2.
Terms
- a(0) =0a(1) =1a(2) =10a(3) =14a(4) =30a(5) =55a(6) =104a(7) =140a(8) =204a(9) =285a(10) =406a(11) =506a(12) =650a(13) =819a(14) =1044a(15) =1240a(16) =1496a(17) =1785a(18) =2146a(19) =2470a(20) =2870a(21) =3311a(22) =3840a(23) =4324a(24) =4900a(25) =5525a(26) =6254a(27) =6930a(28) =7714a(29) =8555
External references
- oeis: A115391