a(n) = floor(T_(n+1)/T_(n)) where T_n is n-th tangential or "Zag" number (see A000182).

Terms

a(0) =2a(1) =8a(2) =17a(3) =29a(4) =44a(5) =63a(6) =85a(7) =110a(8) =138a(9) =170a(10) =205a(11) =243a(12) =284a(13) =329a(14) =376a(15) =427a(16) =482a(17) =539a(18) =600a(19) =664a(20) =731a(21) =802a(22) =876a(23) =953a(24) =1033a(25) =1116a(26) =1203a(27) =1293a(28) =1386a(29) =1483