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A249639 as a simple table

n a(n)
0 0
1 0
2 6
3 66
4 426
5 2706
6 16386
7 99186
8 595986
9 3580986
10 21490986
11 128976186
12 773887386
13 4643505066
14 27861211146
15 167168350506
16 1003011186666
17 6018073616706
18 36108448196946
19 216650728156866
20 1299904407916386
21 7799426681319186
22 46796560321735986

[0,0,6,66,426,2706,16386,99186,595986,3580986,
 21490986,128976186,773887386,4643505066,
 27861211146,167168350506,1003011186666,
 6018073616706,36108448196946,216650728156866,
 1299904407916386,7799426681319186,
 46796560321735986]

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Last modified June 15 07:12 EDT 2021. Contains 345043 sequences. (Running on oeis4.)