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A196836 as a simple table

na(n)
02
15
215
350
4177
5650
62445
79350
836177
9141170
10554325
112186750
128656377
1334355690
14136617405
15544061750
162169039777
178654570210
1834553579685
19138020346350
20551499730377
212204254480730
228811785649165
2335231447872550
24140878711512177
25563373614503250

[2,5,15,50,177,650,2445,9350,36177,141170,554325,
 2186750,8656377,34355690,136617405,544061750,
 2169039777,8654570210,34553579685,138020346350,
 551499730377,2204254480730,8811785649165,
 35231447872550,140878711512177,563373614503250]