25-gonal numbers: a(n) = n*(23*n-21)/2.

Terms

a(0) =0a(1) =1a(2) =25a(3) =72a(4) =142a(5) =235a(6) =351a(7) =490a(8) =652a(9) =837a(10) =1045a(11) =1276a(12) =1530a(13) =1807a(14) =2107a(15) =2430a(16) =2776a(17) =3145a(18) =3537a(19) =3952a(20) =4390a(21) =4851a(22) =5335a(23) =5842a(24) =6372a(25) =6925a(26) =7501a(27) =8100a(28) =8722a(29) =9367