select same list an insert update

clearly following incorrect.

insert `atable` (`a`,`b`) values((select max(`a`) `atable`)*2),'name');

i value:

sql query:

insert `atable` (`a`, `b` )
values 
(
  (
   name max(`a`)
   `atable`
  ) *2
 , 'name'
)

mysql said:

1093 - can't mention aim list 'atable' transform apportionment

so, i'm perplexing bitmap table, any quarrel corresponds bit, 'map' value.

to insert table, i don't wish twin queries, i wish one.
how should i this?

no commented this, nonetheless given i am perplexing bitmap, should * 2 ^ 2, mistake, greatfully note since comments mostly contend ^ 2, an blunder chronicle commenters read.