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A289896 as a simple table

n a(n)
1 0
2 0
3 1
4 8
5 45
6 242
7 1414
8 9432
9 72246
10 628260
11 6116319
12 65856928
13 776628203
14 9950798214
15 137612550620
16 2042588039056
17 32384583304092
18 546155914771464
19 9761655297881037
20 184309987662192600
21 3665514979650544153
22 76586509823743735706
23 1677182881414143407490

[0,0,1,8,45,242,1414,9432,72246,628260,6116319,
 65856928,776628203,9950798214,137612550620,
 2042588039056,32384583304092,546155914771464,
 9761655297881037,184309987662192600,
 3665514979650544153,76586509823743735706,
 1677182881414143407490]

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Last modified September 23 04:54 EDT 2020. Contains 337295 sequences. (Running on oeis4.)