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A089893 as a simple table

na(n)
00
11
24
321
464
5321
61092
75461
816384
981921
10278532
111392661
124210752
1321053761
1471582788
15357913941
161073741824
175368709121
1818253611012
1991268055061
20275951648832
211379758244161
224691178030148
2323455890150741

[0,1,4,21,64,321,1092,5461,16384,81921,278532,
 1392661,4210752,21053761,71582788,357913941,
 1073741824,5368709121,18253611012,91268055061,
 275951648832,1379758244161,4691178030148,
 23455890150741]