A302142 - cp's OEIS frontend

A302142 a(n) = (-1) * round(j((1 + sqrt(-n))/2)), where j is j-invariant.

n	a(n)
1	-1728
2	-233
3	0
4	90
5	539
6	1539
7	3375
8	6511
9	11663
10	19897
11	32768
12	52512
13	82306
14	126616
15	191658
16	286008
17	421407
18	613808
19	884736
20	1263051
21	1787217
22	2508208
23	3493226
24	4830420
25	6634880
26	9056199
27	12288000
28	16579887
29	22252407
30	29715715
31	39492794
32	52248279
33	68824132

[-1728, -233, 0, 90, 539, 1539, 3375, 6511, 11663, 19897, 32768, 52512, 82306, 126616, 191658, 286008, 421407, 613808, 884736, 1263051, 1787217, 2508208, 3493226, 4830420, 6634880, 9056199, 12288000, 16579887, 22252407, 29715715, 39492794, 52248279, 68824132]

cp's OEIS Frontend

A302142 a(n) = (-1) * round(j((1 + sqrt(-n))/2)), where j is j-invariant.

Table of values

List of values