Pentagonal numbers divisible by 4.

Terms

a(0) =0a(1) =12a(2) =92a(3) =176a(4) =376a(5) =532a(6) =852a(7) =1080a(8) =1520a(9) =1820a(10) =2380a(11) =2752a(12) =3432a(13) =3876a(14) =4676a(15) =5192a(16) =6112a(17) =6700a(18) =7740a(19) =8400a(20) =9560a(21) =10292a(22) =11572a(23) =12376a(24) =13776a(25) =14652a(26) =16172a(27) =17120a(28) =18760a(29) =19780