Sum of squares of numbers in row n of array T given by A026758.

Terms

a(0) =1a(1) =2a(2) =6a(3) =27a(4) =92a(5) =453a(6) =1616a(7) =8284a(8) =30254a(9) =159435a(10) =590374a(11) =3178992a(12) =11878204a(13) =65099245a(14) =244797592a(15) =1361584755a(16) =5144714416a(17) =28975155915a(18) =109899043030a(19) =625578384150