How to get query to generate distinct list of number permutations?

Thanks for your help. 
I am looking for a way to get distinct list of number permutations for the following result set.
This is what is given
ID+keyID is unqiue
ID+Seq is unique. Seq can be <= 10
Seq is incrementing integer value 
DECLARE @t TABLE (ID int, keyID int, Seq int)
INSERT @t VALUES 
 (1, 10, 1)
,(1, 11, 2)
,(1, 12, 3)
,(2, 20, 1)
,(2, 21, 2)

SELECT *
FROM @t

-- How do I make from the above data set result below?

-- result set needed
-- result set needed
SELECT *
FROM 
(VALUES
 (1, 10, 1, 1)
,(1, 11, 2, 1)
,(1, 12, 3, 1)
--
,(1, 10, 1, 2)
,(1, 11, 2, 2)
--
,(1, 10, 1, 3)
,(1, 12, 3, 3)
--
,(1, 11, 2, 4)
,(1, 12, 3, 4)

,(1, 10, 1, 5)
--
,(1, 12, 3, 6)
--
,(1, 12, 3, 7)



--
,(2, 20, 1, 1)
,(2, 21, 2, 1)
--
,(2, 20, 1, 2)
--
,(2, 21, 2, 3)
) v (ID, keyID, Seq, grpID)

PS.

this almost gives me what I want but

SELECT *
FROM @t t
JOIN(VALUES (0), (1), (2), (3), (4), (5), (6), (7), (8), (9)) as n(N) ON n.N < t.Seq
ORDER BY t.ID, n.N

Vladimir Moldovanenko