A211064 - cp's OEIS frontend

A211064 Number of 2 X 2 matrices having all terms in {1,...,n} and even determinant.

n	a(n)
1	1
2	10
3	41
4	160
5	337
6	810
7	1345
8	2560
9	3761
10	6250
11	8521
12	12960
13	16801
14	24010
15	30017
16	40960
17	49825
18	65610
19	78121
20	100000
21	117041
22	146410
23	168961
24	207360
25	236497
26	285610
27	322505
28	384160
29	430081
30	506250
31	562561
32	655360
33	723521
34	835210

[1, 10, 41, 160, 337, 810, 1345, 2560, 3761, 6250, 8521, 12960, 16801, 24010, 30017, 40960, 49825, 65610, 78121, 100000, 117041, 146410, 168961, 207360, 236497, 285610, 322505, 384160, 430081, 506250, 562561, 655360, 723521, 835210]

cp's OEIS Frontend

A211064 Number of 2 X 2 matrices having all terms in {1,...,n} and even determinant.

Table of values

List of values