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A107840 as a simple table

n a(n)
1 1
2 1
3 1
4 0
5 4
6 8
7 25
8 63
9 169
10 440
11 1156
12 3024
13 7921
14 20735
15 54289
16 142128
17 372100
18 974168
19 2550409
20 6677055
21 17480761
22 45765224
23 119814916
24 313679520
25 821223649
26 2149991423
27 5628750625
28 14736260448
29 38580030724
30 101003831720

[1,1,1,0,4,8,25,63,169,440,1156,3024,7921,20735,
 54289,142128,372100,974168,2550409,6677055,
 17480761,45765224,119814916,313679520,821223649,
 2149991423,5628750625,14736260448,38580030724,
 101003831720]

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Last modified August 12 08:51 EDT 2020. Contains 336438 sequences. (Running on oeis4.)