(The other thread was locked before I could respond, so I'm posting this here as a non-question.)
Beginning with 12c, there is now a way to associate a sequence with a table. It's a new feature called an Identity column.
create table t
(some_id number generated as identity --< creates a system generated sequence
,name varchar2(30)
);
insert into t (name) values ('Smith');
insert into t (name) values ('Jones');
insert into t (name) values ('Anderson');
commit;
select * from t;
SOME_ID NAME
--------------- ------------------------------
1 Smith
2 Jones
3 Anderson
select table_name, column_name, data_default from user_tab_columns where table_name = 'T' and column_name = 'SOME_ID';
TABLE_NAME COLUMN_NAME DATA_DEFAULT
---------- ----------- -------------------------------------
T SOME_ID "C##SELSE"."ISEQ$$_91955".nextval
select * from user_sequences;
SEQUENCE_NAME
-----------------------------------
ISEQ$$_91955