Structured rhombic dodecahedral numbers (vertex structure 9).

Terms

a(0) =1a(1) =14a(2) =55a(3) =140a(4) =285a(5) =506a(6) =819a(7) =1240a(8) =1785a(9) =2470a(10) =3311a(11) =4324a(12) =5525a(13) =6930a(14) =8555a(15) =10416a(16) =12529a(17) =14910a(18) =17575a(19) =20540a(20) =23821a(21) =27434a(22) =31395a(23) =35720a(24) =40425a(25) =45526a(26) =51039a(27) =56980a(28) =63365a(29) =70210