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A124004 as a simple table

n a(n)
0 1
1 4
2 12
3 56
4 244
5 1396
6 8200
7 55092
8 390216
9 3005288
10 24571056
11 212258216
12 1939879668
13 18429618408
14 184041761768
15 1891831332208
16 20301171282452
17 222742563853912
18 2534535926617852
19 29335558770589276
20 349980362625040712
21 4228388321175157140

[1,4,12,56,244,1396,8200,55092,390216,3005288,
 24571056,212258216,1939879668,18429618408,
 184041761768,1891831332208,20301171282452,
 222742563853912,2534535926617852,
 29335558770589276,349980362625040712,
 4228388321175157140]

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Last modified June 2 21:38 EDT 2024. Contains 373051 sequences. (Running on oeis4.)