Centered cubohemioctahedral numbers: a(n) = 2*n^3+9*n^2+n+1.

Terms

a(0) =1a(1) =13a(2) =55a(3) =139a(4) =277a(5) =481a(6) =763a(7) =1135a(8) =1609a(9) =2197a(10) =2911a(11) =3763a(12) =4765a(13) =5929a(14) =7267a(15) =8791a(16) =10513a(17) =12445a(18) =14599a(19) =16987a(20) =19621a(21) =22513a(22) =25675a(23) =29119a(24) =32857a(25) =36901a(26) =41263a(27) =45955a(28) =50989a(29) =56377