Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet.

A285042

Number of primitive (period n) periodic palindromic structures of length n using an infinite alphabet.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =4a(6) =10a(7) =14a(8) =36a(9) =50a(10) =138a(11) =202a(12) =562a(13) =876a(14) =2589a(15) =4134a(16) =12828a(17) =21146a(18) =69115a(19) =115974a(20) =398619a(21) =678554a(22) =2450202a(23) =4213596a(24) =15939338a(25) =27644432a(26) =109304036a(27) =190899270a(28) =787013630a(29) =1382958544

External references