Number of nonisomorphic ways a loop can cross three roads meeting in a Y n times (orbits under symmetry group of order 6).
A078105
Number of nonisomorphic ways a loop can cross three roads meeting in a Y n times (orbits under symmetry group of order 6).
Terms
- a(0) =1a(1) =0a(2) =1a(3) =1a(4) =2a(5) =1a(6) =8a(7) =8a(8) =48a(9) =54a(10) =331a(11) =439a(12) =2558a(13) =3734a(14) =21057a(15) =33384a(16) =182293a(17) =307719a(18) =1638465a(19) =2913775a(20) =15181584a(21) =28194412a(22) =144206012a(23) =277887666a(24) =1398566992
External references
- oeis: A078105