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A152981 as a simple table

n a(n)
0 1
1 1
2 3
3 7
4 13
5 32
6 72
7 128
8 360
9 1008
10 3836
11 9408
12 15512
13 66960
14 252720
15 785148
16 1137960
17 3340800
18 13072776
19 42465024
20 69530400
21 238761600
22 678562560
23 2412043920
24 5270534880
25 10943277120
26 44922182340
27 117229255200
28 209990825568
29 623486730240
30 1698651339840
31 7019676332760
32 18578092462280

[1,1,3,7,13,32,72,128,360,1008,3836,9408,15512,
 66960,252720,785148,1137960,3340800,13072776,
 42465024,69530400,238761600,678562560,2412043920,
 5270534880,10943277120,44922182340,117229255200,
 209990825568,623486730240,1698651339840,
 7019676332760,18578092462280]

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Last modified March 28 18:04 EDT 2024. Contains 371254 sequences. (Running on oeis4.)