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A000087 as a simple table

na(n)
12
21
32
44
510
637
7138
8628
92972
1014903
1176994
12409594
132222628
1412281570
1568864086
16391120036
172246122574
1813025721601
1976194378042
20449155863868
212666126033850
2215925105028685
2395664343622234
24577651490729530

[2,1,2,4,10,37,138,628,2972,14903,76994,409594,
 2222628,12281570,68864086,391120036,2246122574,
 13025721601,76194378042,449155863868,
 2666126033850,15925105028685,95664343622234,
 577651490729530]