Self-convolution of row n of array T given by A026769.

Terms

a(0) =1a(1) =2a(2) =6a(3) =26a(4) =99a(5) =456a(6) =1898a(7) =9014a(8) =39336a(9) =190852a(10) =859314a(11) =4240598a(12) =19544133a(13) =97854958a(14) =459521694a(15) =2330612590a(16) =11118124352a(17) =57054108568a(18) =275911990190