login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A144220 as a simple table

na(n)
01
12
2-1
3-3
41
51
6-4
70
84
9-1
105
112
12-10
133
141
156
165
17-20
185
196
20-1
21-7
22-9
2335
245
25-21
265
271
28-8
29-14
3056
310
32-56
3314
348
35-1
369
3720
38-84
39-14
40126
41-28
42-36
437
441
4510
4627
47-120
48-42
49252
50-42
51-120
5227
5310
54-1
55-11
56-35
57165
5890
59-462
6042
61330
62-75
63-55
649
651

[1,2,-1,-3,1,1,-4,0,4,-1,5,2,-10,3,1,6,5,-20,5,6,
 -1,-7,-9,35,5,-21,5,1,-8,-14,56,0,-56,14,8,-1,9,
 20,-84,-14,126,-28,-36,7,1,10,27,-120,-42,252,-42,
 -120,27,10,-1,-11,-35,165,90,-462,42,330,-75,-55,
 9,1]