Exponential self-convolution of Jacobsthal numbers (divided by 2).

Terms

a(0) =0a(1) =0a(2) =1a(3) =3a(4) =15a(5) =55a(6) =231a(7) =903a(8) =3655a(9) =14535a(10) =58311a(11) =232903a(12) =932295a(13) =3727815a(14) =14913991a(15) =59650503a(16) =238612935a(17) =954429895a(18) =3817763271a(19) =15270965703a(20) =61084037575a(21) =244335800775a(22) =977343902151