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A113684 as a simple table

na(n)
00
11
24
311
425
552
6102
7193
8356
9645
101153
112040
123580
136241
1410820
1518671
1632089
1754956
1893826
19159745
20271300
21459721
22777409
231312176
242211000
253719617
266248452
2710482323
2817562841
2929391460
3049132638
3182048705
32136884260

[0,1,4,11,25,52,102,193,356,645,1153,2040,3580,
 6241,10820,18671,32089,54956,93826,159745,271300,
 459721,777409,1312176,2211000,3719617,6248452,
 10482323,17562841,29391460,49132638,82048705,
 136884260]