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A242521 as a simple table

n a(n)
1 0
2 0
3 0
4 0
5 0
6 0
7 0
8 0
9 0
10 0
11 0
12 0
13 2
14 4
15 6
16 9
17 42
18 231
19 1052
20 3818
21 10086
22 27892
23 90076
24 310301
25 993680
26 4663558
27 22038882
28 162588454
29 1246422151
30 8655752023
31 58951670318
32 347675502245

[0,0,0,0,0,0,0,0,0,0,0,0,2,4,6,9,42,231,1052,3818,
 10086,27892,90076,310301,993680,4663558,22038882,
 162588454,1246422151,8655752023,58951670318,
 347675502245]

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Last modified March 29 06:57 EDT 2024. Contains 371265 sequences. (Running on oeis4.)