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A221908 as a simple table

na(n)
01
112
248
3234
41320
57806
646692
7279978
81679664
910077750
1060466236
11362797122
122176782408
1313060694094
1478364164180
15470184984666
162821109907552
1716926659444838
18101559956668524
19609359740010610
203656158440063096
2121936950640377982
22131621703842267268

[1,12,48,234,1320,7806,46692,279978,1679664,
 10077750,60466236,362797122,2176782408,
 13060694094,78364164180,470184984666,
 2821109907552,16926659444838,101559956668524,
 609359740010610,3656158440063096,
 21936950640377982,131621703842267268]