Structured octagonal anti-diamond numbers (vertex structure 7).

Terms

a(0) =1a(1) =18a(2) =77a(3) =204a(4) =425a(5) =766a(6) =1253a(7) =1912a(8) =2769a(9) =3850a(10) =5181a(11) =6788a(12) =8697a(13) =10934a(14) =13525a(15) =16496a(16) =19873a(17) =23682a(18) =27949a(19) =32700a(20) =37961a(21) =43758a(22) =50117a(23) =57064a(24) =64625a(25) =72826a(26) =81693a(27) =91252a(28) =101529a(29) =112550