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A000734 as a simple table

na(n)
01
12
25
315
449
5177
6715
73255
816689
995777
10609875
114270695
1232624329
13269995377
142406363835
1522979029335
16234062319969
172533147494977
1829027730898595
19351112918079175
204470508510495609
2159766296291090577

[1,2,5,15,49,177,715,3255,16689,95777,609875,
 4270695,32624329,269995377,2406363835,22979029335,
 234062319969,2533147494977,29027730898595,
 351112918079175,4470508510495609,
 59766296291090577]