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A001444 as a simple table

na(n)
01
12
26
315
445
5126
6378
71107
83321
99882
1029646
1188695
12266085
13797526
142392578
157175547
1621526641
1764573362
18193720086
19581140575
201743421725
215230206126
2215690618378
2347071677987
24141215033961
25423644570442
261270933711326
273812799539655
2811438398618965

[1,2,6,15,45,126,378,1107,3321,9882,29646,88695,
 266085,797526,2392578,7175547,21526641,64573362,
 193720086,581140575,1743421725,5230206126,
 15690618378,47071677987,141215033961,423644570442,
 1270933711326,3812799539655,11438398618965]