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A148560 as a simple table

n a(n)
0 1
1 1
2 3
3 6
4 18
5 50
6 150
7 492
8 1539
9 5371
10 17944
11 63704
12 225744
13 810809
14 2983535
15 10917690
16 40972337
17 153287379
18 581820688
19 2219375147
20 8508412508
21 32915586038
22 127540927543
23 498239905499
24 1950902335531
25 7679230505707
26 30343172222925
27 120261715941901
28 478693474593309
29 1909728214904899

[1,1,3,6,18,50,150,492,1539,5371,17944,63704,
 225744,810809,2983535,10917690,40972337,153287379,
 581820688,2219375147,8508412508,32915586038,
 127540927543,498239905499,1950902335531,
 7679230505707,30343172222925,120261715941901,
 478693474593309,1909728214904899]

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Last modified October 23 17:37 EDT 2020. Contains 337969 sequences. (Running on oeis4.)