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A104137 as a simple table

na(n)
14
28
318
4126
5380
64112
714310
8184410
99272780
1034669602
111857545300
1226818405352
13102282248574
141497215711538
1584973644983780
164885261149611790
1718900353608280300
181101298162244236182
1916628051030379615882

[4,8,18,126,380,4112,14310,184410,9272780,
 34669602,1857545300,26818405352,102282248574,
 1497215711538,84973644983780,4885261149611790,
 18900353608280300,1101298162244236182,
 16628051030379615882]