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A153908 as a simple table

na(n)
01
12
21
32
413
514
644
7452
8799
94626
1086710
11273752
122781435
1391537826
14508729354
159157300668
16533484637064
175243172893020
18166735484693868
1917161483714082216
20298035643554185774
2116752470174524734906
223047662126271875592300

[1,2,1,2,13,14,44,452,799,4626,86710,273752,
 2781435,91537826,508729354,9157300668,
 533484637064,5243172893020,166735484693868,
 17161483714082216,298035643554185774,
 16752470174524734906,3047662126271875592300]