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A132402 as a simple table

na(n)
01
13
27
315
432
570
6156
7348
8768
91672
103600
117696
1216384
1334784
1473664
15155584
16327680
17688256
181442048
193014912
206291456
2113106688
2227261952
2356622080
24117440512
25243271680
26503320576
271040191488
282147483648

[1,3,7,15,32,70,156,348,768,1672,3600,7696,16384,
 34784,73664,155584,327680,688256,1442048,3014912,
 6291456,13106688,27261952,56622080,117440512,
 243271680,503320576,1040191488,2147483648]