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A253008 as a simple table

n a(n)
1 4
2 19
3 54
4 124
5 250
6 14795
7 309990
8 2853292
9 14125312
10 46481352
11 116171792
12 240747928
13 438003360
14 725775144
15 1121905200
16 1644235704
17 2310608832
18 3138866760
19 4146851664
20 5352405720
21 6773371104
22 8427589992
23 10332904560

[4,19,54,124,250,14795,309990,2853292,14125312,
 46481352,116171792,240747928,438003360,725775144,
 1121905200,1644235704,2310608832,3138866760,
 4146851664,5352405720,6773371104,8427589992,
 10332904560]

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Last modified July 22 20:51 EDT 2019. Contains 325226 sequences. (Running on oeis4.)