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A047781 as a simple table

na(n)
00
11
24
319
496
5501
62668
714407
878592
9432073
102390004
1113286043
1274160672
13415382397
142333445468
1513141557519
1674174404608
17419472490257
182376287945572
1913482186743203
2076598310928096
21435730007006341
222481447593848524
2314146164790774359

[0,1,4,19,96,501,2668,14407,78592,432073,2390004,
 13286043,74160672,415382397,2333445468,
 13141557519,74174404608,419472490257,
 2376287945572,13482186743203,76598310928096,
 435730007006341,2481447593848524,
 14146164790774359]