(A209984)/4.

Terms

a(0) =0a(1) =1a(2) =23a(3) =39a(4) =71a(5) =103a(6) =151a(7) =199a(8) =263a(9) =311a(10) =407a(11) =487a(12) =551a(13) =647a(14) =791a(15) =855a(16) =983a(17) =1111a(18) =1255a(19) =1399a(20) =1527a(21) =1623a(22) =1863a(23) =2039a(24) =2167a(25) =2327a(26) =2615a(27) =2759a(28) =2951a(29) =3175