Centered octahemioctahedral numbers: a(n) = (4*n^3+24*n^2+8*n+3)/3.

Terms

a(0) =1a(1) =13a(2) =49a(3) =117a(4) =225a(5) =381a(6) =593a(7) =869a(8) =1217a(9) =1645a(10) =2161a(11) =2773a(12) =3489a(13) =4317a(14) =5265a(15) =6341a(16) =7553a(17) =8909a(18) =10417a(19) =12085a(20) =13921a(21) =15933a(22) =18129a(23) =20517a(24) =23105a(25) =25901a(26) =28913a(27) =32149a(28) =35617a(29) =39325