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A247355 as a simple table

na(n)
00
11
22
33
48
512
628
749
8100
9191
10370
11724
121392
132721
145254
1510223
1619812
1738456
1874628
19144769
20280984
21545107
221057862
232052520
243982816
257728177
2614995626
2729097643
2856460416
29109556004
30212580908
31412491201
32800394316
331553079415
343013584442

[0,1,2,3,8,12,28,49,100,191,370,724,1392,2721,
 5254,10223,19812,38456,74628,144769,280984,545107,
 1057862,2052520,3982816,7728177,14995626,29097643,
 56460416,109556004,212580908,412491201,800394316,
 1553079415,3013584442]