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A181610 as a simple table

n a(n)
1 4
2 18
3 81
4 364
5 1638
6 7371
7 33170
8 149268
9 671701
10 3022653
11 13601945
12 61208743
13 275439346
14 1239477074
15 5577646830
16 25099410745
17 112947348510
18 508263067945
19 2287183805359
20 10292327123878
21 46315472056678
22 208419624257654
23 937888309161430
24 4220497391215744

[4,18,81,364,1638,7371,33170,149268,671701,
 3022653,13601945,61208743,275439346,1239477074,
 5577646830,25099410745,112947348510,508263067945,
 2287183805359,10292327123878,46315472056678,
 208419624257654,937888309161430,4220497391215744]

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Last modified March 28 20:05 EDT 2024. Contains 371254 sequences. (Running on oeis4.)