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A056278 as a simple table

n a(n)
1 0
2 1
3 3
4 6
5 15
6 27
7 63
8 120
9 252
10 495
11 1023
12 2010
13 4095
14 8127
15 16365
16 32640
17 65535
18 130788
19 262143
20 523770
21 1048509
22 2096127
23 4194303
24 8386440
25 16777200
26 33550335
27 67108608
28 134209530
29 268435455

[0,1,3,6,15,27,63,120,252,495,1023,2010,4095,8127,
 16365,32640,65535,130788,262143,523770,1048509,
 2096127,4194303,8386440,16777200,33550335,
 67108608,134209530,268435455]

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Last modified August 11 03:06 EDT 2020. Contains 336421 sequences. (Running on oeis4.)