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A149467 as a simple table

n a(n)
0 1
1 1
2 4
3 13
4 54
5 211
6 900
7 3864
8 17140
9 76671
10 348895
11 1600022
12 7409257
13 34544983
14 162084082
15 764339635
16 3621694614
17 17226889200
18 82230946010
19 393754786454
20 1890628315375
21 9100266393559
22 43901797951237
23 212213506746634
24 1027668820749187
25 4984935211875089
26 24216880591986593
27 117808667147917938

[1,1,4,13,54,211,900,3864,17140,76671,348895,
 1600022,7409257,34544983,162084082,764339635,
 3621694614,17226889200,82230946010,393754786454,
 1890628315375,9100266393559,43901797951237,
 212213506746634,1027668820749187,4984935211875089,
 24216880591986593,117808667147917938]

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Last modified September 19 03:31 EDT 2021. Contains 347550 sequences. (Running on oeis4.)