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A000247 as a simple table

n a(n)
2 0
3 3
4 10
5 25
6 56
7 119
8 246
9 501
10 1012
11 2035
12 4082
13 8177
14 16368
15 32751
16 65518
17 131053
18 262124
19 524267
20 1048554
21 2097129
22 4194280
23 8388583
24 16777190
25 33554405
26 67108836
27 134217699
28 268435426
29 536870881
30 1073741792
31 2147483615

[0,3,10,25,56,119,246,501,1012,2035,4082,8177,
 16368,32751,65518,131053,262124,524267,1048554,
 2097129,4194280,8388583,16777190,33554405,
 67108836,134217699,268435426,536870881,1073741792,
 2147483615]

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Last modified July 13 07:54 EDT 2020. Contains 335685 sequences. (Running on oeis4.)