Six times hexagonal numbers: 6*n*(2*n-1).

Terms

a(0) =0a(1) =6a(2) =36a(3) =90a(4) =168a(5) =270a(6) =396a(7) =546a(8) =720a(9) =918a(10) =1140a(11) =1386a(12) =1656a(13) =1950a(14) =2268a(15) =2610a(16) =2976a(17) =3366a(18) =3780a(19) =4218a(20) =4680a(21) =5166a(22) =5676a(23) =6210a(24) =6768a(25) =7350a(26) =7956a(27) =8586a(28) =9240a(29) =9918