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A121184 as a simple table

na(n)
10
20
31
44
516
650
7160
8476
91431
104203
1112369
1236129
13105451
14307179
15893495
162598476
177545168

[0,0,1,4,16,50,160,476,1431,4203,12369,36129,
 105451,307179,893495,2598476,7545168]