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A302239 as a simple table

na(n)
01
12
26
316
440
596
6226
7512
81140
92488
105336
1111270
1223494
1348356
1498438
15198338
16395846
17783136
181536800
192992818
205786952
2111114950
2221213906
2340247696
2475928804
25142475644
26265985628
27494155176
28913802164
291682338192
303084101744
315630853218
3210240484332
3318553818210

[1,2,6,16,40,96,226,512,1140,2488,5336,11270,
 23494,48356,98438,198338,395846,783136,1536800,
 2992818,5786952,11114950,21213906,40247696,
 75928804,142475644,265985628,494155176,913802164,
 1682338192,3084101744,5630853218,10240484332,
 18553818210]