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A113989 formatted as a simple table:

n a(n)
0 1
1 2
2 4
3 8
4 18
5 46
6 136
7 464
8 1818
9 8122
10 41076
11 233472
12 1480946
13 10412590
14 80634432
15 683674832
16 6312152354
17 63144706754
18 681317547508
19 7896054343496
20 97919789763074
21 1294863406981790
22 18200820837825480
23 271147632138373600

[1,2,4,8,18,46,136,464,1818,8122,41076,233472,
 1480946,10412590,80634432,683674832,6312152354,
 63144706754,681317547508,7896054343496,
 97919789763074,1294863406981790,18200820837825480,
 271147632138373600]

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Last modified November 27 22:38 EST 2009. Contains 167602 sequences.


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