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

Terms

a(0) =1a(1) =16a(2) =67a(3) =176a(4) =365a(5) =656a(6) =1071a(7) =1632a(8) =2361a(9) =3280a(10) =4411a(11) =5776a(12) =7397a(13) =9296a(14) =11495a(15) =14016a(16) =16881a(17) =20112a(18) =23731a(19) =27760a(20) =32221a(21) =37136a(22) =42527a(23) =48416a(24) =54825a(25) =61776a(26) =69291a(27) =77392a(28) =86101a(29) =95440