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A007798 as a simple table

n a(n)
0 0
1 0
2 2
3 18
4 116
5 660
6 3542
7 18438
8 94376
9 478440
10 2411882
11 12118458
12 60769436
13 304378620
14 1523487422
15 7622220078
16 38125449296
17 190670293200
18 953480606162
19 4767790451298
20 23840114517956
21 119204059374180
22 596030757224102
23 2980185167180118
24 14901019979079416

[0,0,2,18,116,660,3542,18438,94376,478440,2411882,
 12118458,60769436,304378620,1523487422,7622220078,
 38125449296,190670293200,953480606162,
 4767790451298,23840114517956,119204059374180,
 596030757224102,2980185167180118,
 14901019979079416]

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Last modified August 19 04:18 EDT 2019. Contains 326109 sequences. (Running on oeis4.)