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A261648 as a simple table

n a(n)
0 1
1 10
2 50
3 180
4 550
5 1512
6 3820
7 9040
8 20310
9 43670
10 90472
11 181540
12 354180
13 674040
14 1254640
15 2289104
16 4101430
17 7228020
18 12546030
19 21473940
20 36281656
21 60565920
22 99974140
23 163297520
24 264110180
25 423211938
26 672244600
27 1059013320
28 1655274320
29 2568068120

[1,10,50,180,550,1512,3820,9040,20310,43670,90472,
 181540,354180,674040,1254640,2289104,4101430,
 7228020,12546030,21473940,36281656,60565920,
 99974140,163297520,264110180,423211938,672244600,
 1059013320,1655274320,2568068120]

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Last modified April 5 00:43 EDT 2020. Contains 333238 sequences. (Running on oeis4.)