Denominator of the Harary number for the path graph P_n.

Terms

a(0) =1a(1) =1a(2) =1a(3) =3a(4) =6a(5) =5a(6) =10a(7) =35a(8) =140a(9) =126a(10) =1260a(11) =1155a(12) =13860a(13) =12870a(14) =12012a(15) =45045a(16) =360360a(17) =340340a(18) =2042040a(19) =1939938a(20) =369512a(21) =117572a(22) =2586584a(23) =7436429a(24) =178474296a(25) =171609900a(26) =1487285800a(27) =1434168450a(28) =40156716600a(29) =38818159380