Inverse binomial transform of double factorial n!! = A006882(n).

Terms

a(0) =1a(1) =0a(2) =1a(3) =-1a(4) =5a(5) =-11a(6) =43a(7) =-127a(8) =489a(9) =-1693a(10) =6771a(11) =-26071a(12) =109693a(13) =-457757a(14) =2028671a(15) =-9039931a(16) =42101329a(17) =-198411489a(18) =967906675a(19) =-4791497559a(20) =24401815141a(21) =-126243354637a(22) =669094876055