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A181879 as a simple table

na(n)
00
11
24
316
465
5263
61065
74312
817459
970690
10286218
111158873
124692181
1318998253
1476922356
15311452261
161261044460
175105864780
1820673224441
1983704176903
20338911293253
211372223811812
225556020785351
2322495868896554
2491083913642878
25368791237300201
261493205235368669
276045864568949689
2824479205885623944
2999114281168039257
30401305531615563236

[0,1,4,16,65,263,1065,4312,17459,70690,286218,
 1158873,4692181,18998253,76922356,311452261,
 1261044460,5105864780,20673224441,83704176903,
 338911293253,1372223811812,5556020785351,
 22495868896554,91083913642878,368791237300201,
 1493205235368669,6045864568949689,
 24479205885623944,99114281168039257,
 401305531615563236]