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A003457 as a simple table

n a(n)
1 0
2 1
3 0
4 1
5 0
6 1
7 0
8 1
9 -1
10 14
11 -140
12 1804
13 -27413
14 487469
15 -10026347
16 236192434
17 -6317862397
18 190439655627
19 -6425425249652
20 241207241774251
21 -10020155328258126
22 458387180159766539
23 -22989944171828251745
24 1259023596072554784855
25 -75008667460769643668557

[0,1,0,1,0,1,0,1,-1,14,-140,1804,-27413,487469,
 -10026347,236192434,-6317862397,190439655627,
 -6425425249652,241207241774251,-10020155328258126,
 458387180159766539,-22989944171828251745,
 1259023596072554784855,-75008667460769643668557]

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Last modified April 24 04:14 EDT 2024. Contains 371918 sequences. (Running on oeis4.)