A252575 - cp's OEIS frontend

A252575 Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

n	a(n)
1	702
2	843
3	1069
4	1694
5	2985
6	5401
7	9936
8	18972
9	36144
10	68328
11	132259
12	254014
13	483085
14	937293
15	1802438
16	3435781
17	6666327
18	12816791
19	24467952
20	47451918
21	91181264
22	174286544
23	337798170
24	648685210
25	1241316959
26	2404367968
27	4614248202

[702, 843, 1069, 1694, 2985, 5401, 9936, 18972, 36144, 68328, 132259, 254014, 483085, 937293, 1802438, 3435781, 6666327, 12816791, 24467952, 47451918, 91181264, 174286544, 337798170, 648685210, 1241316959, 2404367968, 4614248202]

cp's OEIS Frontend

A252575 Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7.

Table of values

List of values