Main diagonal of triangle A100229.

Terms

a(0) =1a(1) =2a(2) =10a(3) =35a(4) =118a(5) =392a(6) =1297a(7) =4286a(8) =14158a(9) =46763a(10) =154450a(11) =510116a(12) =1684801a(13) =5564522a(14) =18378370a(15) =60699635a(16) =200477278a(17) =662131472a(18) =2186871697a(19) =7222746566a(20) =23855111398a(21) =78788080763a(22) =260219353690a(23) =859446141836