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A099202 as a simple table

na(n)
01
11
24
316
4256
54096
6262144
716777216
84294967296
91099511627776
101125899906842624
111152921504606846976
124722366482869645213696
1319342813113834066795298816
14316912650057057350374175801344

[1,1,4,16,256,4096,262144,16777216,4294967296,
 1099511627776,1125899906842624,
 1152921504606846976,4722366482869645213696,
 19342813113834066795298816,
 316912650057057350374175801344]