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A019223 as a simple table

n a(n)
3 0
4 1
5 2
6 2
7 9
8 19
9 42
10 114
11 200
12 541
13 1245
14 3156
15 7749
16 19302
17 50037
18 126450
19 328007
20 855433
21 2203762
22 5760303
23 15014254
24 39272601
25 103120543
26 270926082
27 714045925
28 1885561006
29 4988680648
30 13228926950
31 35146194424

[0,1,2,2,9,19,42,114,200,541,1245,3156,7749,19302,
 50037,126450,328007,855433,2203762,5760303,
 15014254,39272601,103120543,270926082,714045925,
 1885561006,4988680648,13228926950,35146194424]

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Last modified October 27 23:46 EDT 2021. Contains 348305 sequences. (Running on oeis4.)