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A278358 as a simple table

n a(n)
1 4
2 27
3 142
4 701
5 3183
6 12875
7 46236
8 149099
9 438091
10 1188762
11 3012869
12 7198373
13 16335098
14 35425161
15 73791748
16 148267982
17 288389734
18 544658465
19 1001416052
20 1796525377
21 3150931185
22 5412350915
23 9118895376
24 15090442305
25 24558200485

[4,27,142,701,3183,12875,46236,149099,438091,
 1188762,3012869,7198373,16335098,35425161,
 73791748,148267982,288389734,544658465,1001416052,
 1796525377,3150931185,5412350915,9118895376,
 15090442305,24558200485]

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Last modified June 26 00:12 EDT 2022. Contains 354870 sequences. (Running on oeis4.)