Pentagonal numbers multiplied by 2: a(n) = n*(3*n-1).

Terms

a(0) =0a(1) =2a(2) =10a(3) =24a(4) =44a(5) =70a(6) =102a(7) =140a(8) =184a(9) =234a(10) =290a(11) =352a(12) =420a(13) =494a(14) =574a(15) =660a(16) =752a(17) =850a(18) =954a(19) =1064a(20) =1180a(21) =1302a(22) =1430a(23) =1564a(24) =1704a(25) =1850a(26) =2002a(27) =2160a(28) =2324a(29) =2494