Binomial coefficient C(22,n).

Terms

a(0) =1a(1) =22a(2) =231a(3) =1540a(4) =7315a(5) =26334a(6) =74613a(7) =170544a(8) =319770a(9) =497420a(10) =646646a(11) =705432a(12) =646646a(13) =497420a(14) =319770a(15) =170544a(16) =74613a(17) =26334a(18) =7315a(19) =1540a(20) =231a(21) =22a(22) =1