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A371564 as a simple table

na(n)
00
10
21
33
46
513
628
756
8113
9231
10464
11930
121875
133766
147547
1515151
1630398
1760917
18122116
19244786
20490435
21982544
221968413
233942649
247896116
2515813268
2631665423
2763403245
28126945244
29254152625
30508798604
311018538560
322038870881
334081149015
348168806568

[0,0,1,3,6,13,28,56,113,231,464,930,1875,3766,
 7547,15151,30398,60917,122116,244786,490435,
 982544,1968413,3942649,7896116,15813268,31665423,
 63403245,126945244,254152625,508798604,1018538560,
 2038870881,4081149015,8168806568]