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A111955 as a simple table

na(n)
00
11
24
37
420
545
6112
7267
8648
91561
103772
119103
1221980
1353061
14128104
15309267
16746640
171802545
184351732
1910506007
2025363748
2161233501
22147830752
23356895003
24861620760
252080136521
265021893804
2712123924127
2829269742060
2970663408245

[0,1,4,7,20,45,112,267,648,1561,3772,9103,21980,
 53061,128104,309267,746640,1802545,4351732,
 10506007,25363748,61233501,147830752,356895003,
 861620760,2080136521,5021893804,12123924127,
 29269742060,70663408245]