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A137645 as a simple table

na(n)
01
10
21
34
442
5608
610986
7240492
86167112
9181154848
105995624710
11220711502648
128943846698096
13395588177834784
1418962600075658460
15979198125493716492
1654189002212286942316
173199366560075461850320
18200730550064907653703510
1913336507142191259122442532
20935401326531455246646557760
2169066745767857553528070539760
225355032622687046432711489319940

[1,0,1,4,42,608,10986,240492,6167112,181154848,
 5995624710,220711502648,8943846698096,
 395588177834784,18962600075658460,
 979198125493716492,54189002212286942316,
 3199366560075461850320,200730550064907653703510,
 13336507142191259122442532,
 935401326531455246646557760,
 69066745767857553528070539760,
 5355032622687046432711489319940]