Number of primitive (period n) periodic palindromic structures using a maximum of five different symbols.

A056516

Number of primitive (period n) periodic palindromic structures using a maximum of five different symbols.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =4a(6) =10a(7) =14a(8) =36a(9) =50a(10) =137a(11) =201a(12) =548a(13) =854a(14) =2417a(15) =3839a(16) =11060a(17) =18001a(18) =52599a(19) =86471a(20) =254982a(21) =421989a(22) =1252695a(23) =2079474a(24) =6196990a(25) =10306747a(26) =30795387a(27) =51263890a(28) =153409228a(29) =255514354

External references