First column of square array A130462.

Terms

a(0) =1a(1) =1a(2) =3a(3) =7a(4) =25a(5) =75a(6) =275a(7) =927a(8) =3438a(9) =12306a(10) =46131a(11) =170695a(12) =646399a(13) =2439582a(14) =9321149a(15) =35629281a(16) =137156187a(17) =528893353a(18) =2048588717a(19) =7950709147a(20) =30951860693a(21) =120722736668a(22) =471927571577