Sum of squares of numbers in row n of array T given by A026725.

Terms

a(0) =1a(1) =2a(2) =6a(3) =27a(4) =92a(5) =440a(6) =1556a(7) =7514a(8) =27082a(9) =130883a(10) =477258a(11) =2303413a(12) =8465592a(13) =40783083a(14) =150735628a(15) =724837891a(16) =2690363900a(17) =12915186640a(18) =48093650016a(19) =230526280814a(20) =860654319126