Binomial transform of A023871.

Terms

a(0) =1a(1) =2a(2) =8a(3) =33a(4) =131a(5) =497a(6) =1834a(7) =6635a(8) =23622a(9) =82942a(10) =287656a(11) =986552a(12) =3349165a(13) =11263951a(14) =37558235a(15) =124240204a(16) =407951848a(17) =1330340478a(18) =4310385956a(19) =13881618570a(20) =44451643311a(21) =141578435571a(22) =448634389388