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A120940 as a simple table

na(n)
00
11
23
36
414
526
652
795
8177
9318
10572
111012
121784
133117
145423
159382
1616170
1727758
1847500
1981035
20137885
21234046
22396408
23670056
241130544
251904281
263202587
275378310
289020102
2915109058
3025279012
3142248567
3270537929
33117657342
34196076468
35326485852

[0,1,3,6,14,26,52,95,177,318,572,1012,1784,3117,
 5423,9382,16170,27758,47500,81035,137885,234046,
 396408,670056,1130544,1904281,3202587,5378310,
 9020102,15109058,25279012,42248567,70537929,
 117657342,196076468,326485852]