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A004187 as a simple table

na(n)
00
11
27
348
4329
52255
615456
7105937
8726103
94976784
1034111385
11233802911
121602508992
1310983760033
1475283811239
15516002918640
163536736619241
1724241153416047
18166151337293088
191138818207635569
207805576116155895
2153500214605455696
22366695926122033977

[0,1,7,48,329,2255,15456,105937,726103,4976784,
 34111385,233802911,1602508992,10983760033,
 75283811239,516002918640,3536736619241,
 24241153416047,166151337293088,1138818207635569,
 7805576116155895,53500214605455696,
 366695926122033977]