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A001518 formatted as a simple table:

n a(n)
0 1
1 4
2 37
3 559
4 11776
5 318511
6 10522639
7 410701432
8 18492087079
9 943507142461
10 53798399207356
11 3390242657205889
12 233980541746413697
13 17551930873638233164
14 1421940381306443299981
15 123726365104534205331511
16 11507973895102987539130504

[1,4,37,559,11776,318511,10522639,410701432,
 18492087079,943507142461,53798399207356,
 3390242657205889,233980541746413697,
 17551930873638233164,1421940381306443299981,
 123726365104534205331511,
 11507973895102987539130504]

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Last modified December 6 22:55 EST 2009. Contains 170429 sequences.


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