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A321421 as a simple table

n a(n)
0 1
1 11
2 51
3 211
4 851
5 3411
6 13651
7 54611
8 218451
9 873811
10 3495251
11 13981011
12 55924051
13 223696211
14 894784851
15 3579139411
16 14316557651
17 57266230611
18 229064922451
19 916259689811
20 3665038759251
21 14660155037011
22 58640620148051
23 234562480592211
24 938249922368851

[1,11,51,211,851,3411,13651,54611,218451,873811,
 3495251,13981011,55924051,223696211,894784851,
 3579139411,14316557651,57266230611,229064922451,
 916259689811,3665038759251,14660155037011,
 58640620148051,234562480592211,938249922368851]

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Last modified April 17 23:23 EDT 2024. Contains 371767 sequences. (Running on oeis4.)