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A017491 as a simple table

na(n)
02097152
1893871739
221870000000
3194754273881
41028071702528
53938980639167
612151280273024
732057708828125
875144747810816
9160578147647843
10318547390056832
11594467302491009
121054135040000000
131789940649848551
142928229434235008
154637914326451397
167140436495826944

[2097152,893871739,21870000000,194754273881,
 1028071702528,3938980639167,12151280273024,
 32057708828125,75144747810816,160578147647843,
 318547390056832,594467302491009,1054135040000000,
 1789940649848551,2928229434235008,
 4637914326451397,7140436495826944]