Modified Euler numbers.

Terms

a(0) =1a(1) =0a(2) =-2a(3) =-3a(4) =4a(5) =15a(6) =-62a(7) =-273a(8) =1384a(9) =7935a(10) =-50522a(11) =-353793a(12) =2702764a(13) =22368255a(14) =-199360982a(15) =-1903757313a(16) =19391512144a(17) =209865342975