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A009748 as a simple table

na(n)
00
12
212
3118
41880
563274
64010212
7332200222
832100167600
93749943333714
10559340287979196
11106082041802123974
1224279253761809428744
136438550081937270152314
141958379738778789723419028

[0,2,12,118,1880,63274,4010212,332200222,
 32100167600,3749943333714,559340287979196,
 106082041802123974,24279253761809428744,
 6438550081937270152314,1958379738778789723419028]