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A288687 as a simple table

n a(n)
0 1
1 1
2 4
3 19
4 92
5 421
6 1830
7 7687
8 31624
9 128521
10 518666
11 2084875
12 8361996
13 33497101
14 134094862
15 536608783
16 2146926608
17 8588754961
18 34357248018
19 137433710611
20 549744803860
21 2199000186901
22 8796044787734
23 35184271425559
24 140737278640152
25 562949517213721

[1,1,4,19,92,421,1830,7687,31624,128521,518666,
 2084875,8361996,33497101,134094862,536608783,
 2146926608,8588754961,34357248018,137433710611,
 549744803860,2199000186901,8796044787734,
 35184271425559,140737278640152,562949517213721]

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Last modified January 16 21:37 EST 2019. Contains 319206 sequences. (Running on oeis4.)