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A091141 as a simple table

n a(n)
1 1
2 4
3 13
4 40
5 124
6 382
7 1180
8 3640
9 11236
10 34672
11 107008
12 330232
13 1019152
14 3145216
15 9706576
16 29955712
17 92447296
18 285304288
19 880486336
20 2717295232
21 8385927232
22 25880062720
23 79869243904
24 246486884224
25 760690618624
26 2347590286336
27 7244969278720
28 22358918465536

[1,4,13,40,124,382,1180,3640,11236,34672,107008,
 330232,1019152,3145216,9706576,29955712,92447296,
 285304288,880486336,2717295232,8385927232,
 25880062720,79869243904,246486884224,760690618624,
 2347590286336,7244969278720,22358918465536]

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)