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A097940 formatted as a simple table:

n a(n)
1 1
2 4
3 8
4 20
5 37
6 86
7 173
8 372
9 788
10 1680
11 3550
12 7554
13 15994
14 33820
15 71374
16 150376
17 316151
18 663474
19 1389760
20 2906116
21 6066899
22 12645608
23 26318870
24 54700044
25 113536171
26 235363832
27 487342781
28 1007969620
29 2082597193
30 4298660754

[1,4,8,20,37,86,173,372,788,1680,3550,7554,15994,
 33820,71374,150376,316151,663474,1389760,2906116,
 6066899,12645608,26318870,54700044,113536171,
 235363832,487342781,1007969620,2082597193,
 4298660754]

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Last modified December 9 14:43 EST 2009. Contains 170430 sequences.


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