Self-convolution of array T given by A026374.

Terms

a(0) =1a(1) =2a(2) =11a(3) =34a(4) =195a(5) =678a(6) =3989a(7) =14494a(8) =86515a(9) =321590a(10) =1936881a(11) =7301142a(12) =44241261a(13) =168359754a(14) =1024642875a(15) =3926147730a(16) =23973456915a(17) =92338836390a(18) =565280386625