Centered cube numbers: n^3 + (n+1)^3.

Terms

a(0) =1a(1) =9a(2) =35a(3) =91a(4) =189a(5) =341a(6) =559a(7) =855a(8) =1241a(9) =1729a(10) =2331a(11) =3059a(12) =3925a(13) =4941a(14) =6119a(15) =7471a(16) =9009a(17) =10745a(18) =12691a(19) =14859a(20) =17261a(21) =19909a(22) =22815a(23) =25991a(24) =29449a(25) =33201a(26) =37259a(27) =41635a(28) =46341a(29) =51389