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A251213 as a simple table

n a(n)
1 21
2 63
3 191
4 589
5 1807
6 5569
7 17119
8 52713
9 162143
10 499081
11 1535535
12 4725689
13 14541087
14 44748169
15 137696911
16 423732505
17 1303909887
18 4012461097
19 12347225455
20 37995389753
21 116920467935
22 359791896905
23 1107162729807
24 3406999063641

[21,63,191,589,1807,5569,17119,52713,162143,
 499081,1535535,4725689,14541087,44748169,
 137696911,423732505,1303909887,4012461097,
 12347225455,37995389753,116920467935,359791896905,
 1107162729807,3406999063641]

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Last modified April 16 18:51 EDT 2024. Contains 371750 sequences. (Running on oeis4.)