Number of vertex labels congruent to 1 modulo 3 of level n of the irregular triangle A324246.

Terms

a(0) =0a(1) =0a(2) =2a(3) =0a(4) =0a(5) =5a(6) =3a(7) =7a(8) =12a(9) =12a(10) =30a(11) =51a(12) =75a(13) =139a(14) =232a(15) =365a(16) =640a(17) =1029a(18) =1717a(19) =2872a(20) =4789a(21) =7996a(22) =13338a(23) =22288a(24) =36896a(25) =61942a(26) =102746a(27) =170993a(28) =286029a(29) =476053