A239980 - cp's OEIS frontend

A239980 Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

n	a(n)
1	1
2	3
3	6
4	16
5	40
6	84
7	208
8	474
9	1047
10	2530
11	5668
12	12907
13	30446
14	68427
15	157875
16	366480
17	830089
18	1920870
19	4421253
20	10083067
21	23303103
22	53453752
23	122448587
24	282350403
25	647215090
26	1486007814
27	3420002865
28	7842656682
29	18022838258
30	41428828907

[1, 3, 6, 16, 40, 84, 208, 474, 1047, 2530, 5668, 12907, 30446, 68427, 157875, 366480, 830089, 1920870, 4421253, 10083067, 23303103, 53453752, 122448587, 282350403, 647215090, 1486007814, 3420002865, 7842656682, 18022838258, 41428828907]

cp's OEIS Frontend

A239980 Number of n X 2 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of elements above it or one plus the sum of the elements diagonally to its northwest, modulo 4.

Table of values

List of values