Arvorezinha 2.0 em Oracle SQL

arvorezinha

select * from (
  select 'a'||lpad(level, 5,'0') as linha, 
         rpad(' ', &altura-level, ' ') || rpad('*', 2*level-1, '*') as arvorezinha
  from dual
  connect by level <= &altura
  union 
  select 't'||lpad(level, 5,'0') as linha,
         rpad(' ', ((2*&altura-1)/4)+1, ' ')||rpad('#', (2*&altura-1)/2, '#')
  from dual
  where mod(&altura, 2) = 0
  connect by level <= (&altura/2)
  union
  select 't'||lpad(level, 5,'0') as linha,
         rpad(' ', ((2*&altura-1)/4), ' ')||rpad('#', (2*&altura-1)/2+1, '#')
  from dual
  where mod(&altura, 2) > 0
  connect by level <= (&altura/2)
) order by linha asc;