Pyramidal 47-gonal numbers.

Terms

a(0) =1a(1) =48a(2) =186a(3) =460a(4) =915a(5) =1596a(6) =2548a(7) =3816a(8) =5445a(9) =7480a(10) =9966a(11) =12948a(12) =16471a(13) =20580a(14) =25320a(15) =30736a(16) =36873a(17) =43776a(18) =51490a(19) =60060a(20) =69531a(21) =79948a(22) =91356a(23) =103800a(24) =117325a(25) =131976a(26) =147798a(27) =164836a(28) =183135a(29) =202740