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A001850 as a simple table

n a(n)
0 1
1 3
2 13
3 63
4 321
5 1683
6 8989
7 48639
8 265729
9 1462563
10 8097453
11 45046719
12 251595969
13 1409933619
14 7923848253
15 44642381823
16 252055236609
17 1425834724419
18 8079317057869
19 45849429914943
20 260543813797441
21 1482376214227923
22 8443414161166173

[1,3,13,63,321,1683,8989,48639,265729,1462563,
 8097453,45046719,251595969,1409933619,7923848253,
 44642381823,252055236609,1425834724419,
 8079317057869,45849429914943,260543813797441,
 1482376214227923,8443414161166173]

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Last modified November 17 10:07 EST 2018. Contains 317275 sequences. (Running on oeis4.)