Indices of the pentagonal numbers listed in A209049.

Terms

a(0) =1a(1) =2a(2) =4a(3) =3a(4) =12a(5) =11a(6) =32a(7) =27a(8) =75a(9) =192a(10) =427a(11) =171a(12) =1323a(13) =2187a(14) =6912a(15) =8192a(16) =4779a(17) =10923a(18) =49152a(19) =109227a(20) =60075a(21) =170667a(22) =786432a(23) =699051a(24) =1092267a(25) =4893355a(26) =5810859a(27) =11184811a(28) =25864875a(29) =95070891