Sum of the numbers in row n of the array at A249074.

Terms

a(0) =1a(1) =5a(2) =11a(3) =51a(4) =161a(5) =773a(6) =3027a(7) =15395a(8) =69881a(9) =377781a(10) =1915163a(11) =10981907a(12) =60776145a(13) =368269541a(14) =2191553891a(15) =13976179203a(16) =88489011497a(17) =591631462805