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A123306 as a simple table

na(n)
01
11
22
36
426
5156
61234
712340
8150994
92204112
1037617314
11738465620
1216451763834
13411281292920
1411427727238034
15350040470610996
1611736423864328466
17428080429306305136
1816893650334361392866

[1,1,2,6,26,156,1234,12340,150994,2204112,
 37617314,738465620,16451763834,411281292920,
 11427727238034,350040470610996,11736423864328466,
 428080429306305136,16893650334361392866]