Sequence (a(n): n >= 1) that shifts left 2 places under the "CHK" (necklace, identity, unlabeled) transform and has initial terms a(1) = a(2) = 1.

A032173

Sequence (a(n): n >= 1) that shifts left 2 places under the "CHK" (necklace, identity, unlabeled) transform and has initial terms a(1) = a(2) = 1.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =3a(6) =7a(7) =12a(8) =28a(9) =55a(10) =122a(11) =258a(12) =574a(13) =1254a(14) =2813a(15) =6283a(16) =14220a(17) =32237a(18) =73631a(19) =168660a(20) =388331a(21) =896790a(22) =2078822a(23) =4832343a(24) =11266422a(25) =26332119a(26) =61694574a(27) =144858260a(28) =340829231a(29) =803427128

External references