Number of reversible strings with n-1 beads of 2 colors. 6 beads are black. Strings are not palindromic.
A032093
Number of reversible strings with n-1 beads of 2 colors. 6 beads are black. Strings are not palindromic.
Terms
- a(0) =3a(1) =12a(2) =40a(3) =100a(4) =226a(5) =452a(6) =848a(7) =1484a(8) =2485a(9) =3976a(10) =6160a(11) =9240a(12) =13524a(13) =19320a(14) =27072a(15) =37224a(16) =50391a(17) =67188a(18) =88440a(19) =114972a(20) =147862a(21) =188188a(22) =237328a(23) =296660a(24) =367913a(25) =452816a(26) =553504a(27) =672112a(28) =811240a(29) =973488
External references
- oeis: A032093