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A254076 as a simple table

na(n)
0-1
1-2
2-4
31
42
513
626
761
8122
9253
10506
111021
122042
134093
148186
1516381
1632762
1765533
18131066
19262141
20524282
211048573
222097146
234194301
248388602
2516777213
2633554426
2767108861
28134217722
29268435453
30536870906
311073741821
322147483642
334294967293

[-1,-2,-4,1,2,13,26,61,122,253,506,1021,2042,4093,
 8186,16381,32762,65533,131066,262141,524282,
 1048573,2097146,4194301,8388602,16777213,33554426,
 67108861,134217722,268435453,536870906,1073741821,
 2147483642,4294967293]