Self-convolution of array T given by A026703.

Terms

a(0) =1a(1) =2a(2) =11a(3) =52a(4) =243a(5) =1252a(6) =5773a(7) =30118a(8) =138709a(9) =725582a(10) =3341873a(11) =17491838a(12) =80576661a(13) =421772338a(14) =1943163731a(15) =10170325444a(16) =46860603595a(17) =245231971772