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A138413 as a simple table

n a(n)
0 0
1 0
2 2
3 18
4 186
5 2120
6 25724
7 325878
8 4260282
9 57048048
10 778483932
11 10786724388
12 151355847012
13 2146336125648
14 30711521221376
15 442862000693438
16 6429286894263738
17 93891870710425440
18 1378379704593824300
19 20330047491994213884
20 301111732041234778316
21 4476705468260134734384
22 66784808491631598524136

[0,0,2,18,186,2120,25724,325878,4260282,57048048,
 778483932,10786724388,151355847012,2146336125648,
 30711521221376,442862000693438,6429286894263738,
 93891870710425440,1378379704593824300,
 20330047491994213884,301111732041234778316,
 4476705468260134734384,66784808491631598524136]

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Last modified November 19 00:12 EST 2018. Contains 317332 sequences. (Running on oeis4.)