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A163137 as a simple table

n a(n)
1 1
2 2
3 4
4 13
5 39
6 113
7 359
8 1161
9 3708
10 11961
11 38903
12 126885
13 415509
14 1365935
15 4501009
16 14856863
17 49115474
18 162590020
19 538828790
20 1787431873
21 5934532485
22 19718347615
23 65559507987
24 218095336290
25 725890070743
26 2417022095921

[1,2,4,13,39,113,359,1161,3708,11961,38903,126885,
 415509,1365935,4501009,14856863,49115474,
 162590020,538828790,1787431873,5934532485,
 19718347615,65559507987,218095336290,725890070743,
 2417022095921]

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Last modified May 24 11:30 EDT 2013. Contains 225620 sequences.