Construktion
bimagic

2	14	21	8	20
23	10	17	4	11
19	1	13	25	7
15	22	9	16	3
6	18	5	12	24

10	18	1	14	22
11	24	7	20	3
17	5	13	21	9
23	6	19	2	15
4	12	25	8	16

n = 9

1	15	24	8	17
23	7	16	5	14
20	4	13	22	6
12	21	10	19	3
9	18	2	11	25

n = 11

7	18	4	15	21
14	25	6	17	3
16	2	13	24	10
23	9	20	1	12
5	11	22	8	19

n = 12

16	8	25	12	4
15	2	19	6	23
9	21	13	5	17
3	20	7	24	11
22	14	1	18	10

n = 16

24	12	5	18	6
3	16	9	22	15
7	25	13	1	19
11	4	17	10	23
20	8	21	14	2

n = 20/24/28

19	8	22	11	5
12	1	20	9	23
10	24	13	2	16
3	17	6	25	14
21	15	4	18	7

n = 25

25	11	2	18	9
3	19	10	21	12
6	22	13	4	20
14	5	16	7	23
17	8	24	15	1

n = 27

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Bimagic Squares of order 20

I know only one single method to create different bimagic squares of orders n=20, 24 or 28.

	Method
	Chen – Li