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A006043 formatted as a simple table:

n a(n)
0 2
1 18
2 108
3 540
4 2430
5 10206
6 40824
7 157464
8 590490
9 2165130
10 7794468
11 27634932
12 96722262
13 334807830
14 1147912560
15 3902902704
16 13172296626
17 44165935746
18 147219785820
19 488149816140
20 1610894393262
21 5292938720718

[2,18,108,540,2430,10206,40824,157464,590490,
 2165130,7794468,27634932,96722262,334807830,
 1147912560,3902902704,13172296626,44165935746,
 147219785820,488149816140,1610894393262,
 5292938720718]

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Last modified November 30 13:13 EST 2009. Contains 167758 sequences.


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