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A172396 as a simple table

n a(n)
0 1
1 1
2 1
3 0
4 3
5 0
6 38
7 0
8 947
9 0
10 37394
11 0
12 2120190
13 0
14 162980012
15 0
16 16330173251
17 0
18 2070201641498
19 0
20 324240251016266
21 0
22 61525045423103316
23 0
24 13913915097436287598
25 0
26 3698477457114061621492
27 0

[1,1,1,0,3,0,38,0,947,0,37394,0,2120190,0,
 162980012,0,16330173251,0,2070201641498,0,
 324240251016266,0,61525045423103316,0,
 13913915097436287598,0,3698477457114061621492,0]

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Last modified February 23 21:40 EST 2024. Contains 370288 sequences. (Running on oeis4.)