Number of perfect rulers with n segments (n>=0).

Terms

a(0) =1a(1) =1a(2) =3a(3) =9a(4) =24a(5) =88a(6) =254a(7) =1064a(8) =1644a(9) =3382a(10) =4156a(11) =8022a(12) =26264a(13) =52012a(14) =25434a(15) =8506a(16) =5632a(17) =6224a(18) =12330a(19) =34224a(20) =108854a(21) =103156a(22) =75992a(23) =86560a(24) =69084