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A026977 formatted as a simple table:

n a(n)
1 1
2 4
3 24
4 90
5 365
6 1376
7 7365
8 28002
9 121049
10 465004
11 2437089
12 9396986
13 41758527
14 162167568
15 842470494
16 3277804402
17 14798196587
18 57865149612
19 299015494394 

[1,4,24,90,365,1376,7365,28002,121049,465004,
 2437089,9396986,41758527,162167568,842470494,
 3277804402,14798196587,57865149612,299015494394]

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Last modified December 5 17:24 EST 2009. Contains 170342 sequences.

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