A240761 - cp's OEIS frontend

A240761 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

n	a(n)
1	2
2	6
3	9
4	42
5	124
6	474
7	1440
8	5239
9	16730
10	58945
11	192711
12	666682
13	2209028
14	7562090
15	25254050
16	85922148
17	288250557
18	977287148
19	3287088851
20	11122488393
21	37465304475
22	126628657804
23	426895509278
24	1441942470916
25	4863435928395

[2, 6, 9, 42, 124, 474, 1440, 5239, 16730, 58945, 192711, 666682, 2209028, 7562090, 25254050, 85922148, 288250557, 977287148, 3287088851, 11122488393, 37465304475, 126628657804, 426895509278, 1441942470916, 4863435928395]

cp's OEIS Frontend

A240761 Number of 2Xn 0..3 arrays with no element equal to one plus the sum of elements to its left or zero plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest or zero plus the sum of the elements antidiagonally to its northeast, modulo 4.

Table of values

List of values