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A009253 as a simple table

na(n)
01
11
21
36
421
5112
6717
74592
838857
9318208
103158329
1132169984
12363525789
134399544320
1456250039237
15779244812288
1611210469917713
17173483433263104
182783865475754737
1947421793222656000
20840008000833503141

[1,1,1,6,21,112,717,4592,38857,318208,3158329,
 32169984,363525789,4399544320,56250039237,
 779244812288,11210469917713,173483433263104,
 2783865475754737,47421793222656000,
 840008000833503141]