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A098156 as a simple table

na(n)
01
12
25
313
432
576
6176
7400
8896
91984
104352
119472
1220480
1344032
1494208
15200704
16425984
17901120
181900544
193997696
208388608
2117563648
2236700160
2376546048
24159383552
25331350016
26687865856
271426063360
282952790016
296106906624

[1,2,5,13,32,76,176,400,896,1984,4352,9472,20480,
 44032,94208,200704,425984,901120,1900544,3997696,
 8388608,17563648,36700160,76546048,159383552,
 331350016,687865856,1426063360,2952790016,
 6106906624]