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A007863 as a simple table

na(n)
01
12
27
331
4154
5820
64575
726398
8156233
9943174
105785416
1135955297
12225914342
131432705496
149158708775
1558954911423
16381806076426
172485972170888
1816263884777805
19106858957537838
20704810376478024
214664987368511948
2230974829705533240
23206266525653071416

[1,2,7,31,154,820,4575,26398,156233,943174,
 5785416,35955297,225914342,1432705496,9158708775,
 58954911423,381806076426,2485972170888,
 16263884777805,106858957537838,704810376478024,
 4664987368511948,30974829705533240,
 206266525653071416]