Sum of squares of numbers in row n of array T given by A026736.

Terms

a(0) =1a(1) =2a(2) =6a(3) =20a(4) =79a(5) =284a(6) =1237a(7) =4542a(8) =20626a(9) =76406a(10) =354080a(11) =1317964a(12) =6173634a(13) =23051344a(14) =108628550a(15) =406513364a(16) =1922354351a(17) =7206349304a(18) =34147706833a(19) =128187589014a(20) =608151037123