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A135440 as a simple table

na(n)
0-1
14
22
310
414
534
662
7130
8254
9514
101022
112050
124094
138194
1416382
1532770
1665534
17131074
18262142
19524290
201048574
212097154
224194302
238388610
2416777214
2533554434
2667108862
27134217730
28268435454
29536870914
301073741822
312147483650
324294967294
338589934594
3417179869182
3534359738370

[-1,4,2,10,14,34,62,130,254,514,1022,2050,4094,
 8194,16382,32770,65534,131074,262142,524290,
 1048574,2097154,4194302,8388610,16777214,33554434,
 67108862,134217730,268435454,536870914,1073741822,
 2147483650,4294967294,8589934594,17179869182,
 34359738370]