One half of total number of round trips, each of length 2n, on the graph P_6 (o-o-o-o-o-o).
A198636
One half of total number of round trips, each of length 2n, on the graph P_6 (o-o-o-o-o-o).
Terms
- a(0) =3a(1) =5a(2) =13a(3) =38a(4) =117a(5) =370a(6) =1186a(7) =3827a(8) =12389a(9) =40169a(10) =130338a(11) =423065a(12) =1373466a(13) =4459278a(14) =14478659a(15) =47011093a(16) =152642789a(17) =495626046a(18) =1609284589a(19) =5225309458a(20) =16966465802a(21) =55089756851a(22) =178875298901a(23) =580804419201
External references
- oeis: A198636