A251143 - cp's OEIS frontend

A251143 Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

n	a(n)
1	27
2	49
3	87
4	161
5	299
6	565
7	1075
8	2065
9	3991
10	7761
11	15163
12	29749
13	58563
14	115617
15	228791
16	453633
17	900875
18	1791413
19	3566099
20	7105137
21	14166487
22	28262129
23	56409627
24	112633781
25	224967459
26	449449345
27	898113015
28	1794954785
29	3587852651

[27, 49, 87, 161, 299, 565, 1075, 2065, 3991, 7761, 15163, 29749, 58563, 115617, 228791, 453633, 900875, 1791413, 3566099, 7105137, 14166487, 28262129, 56409627, 112633781, 224967459, 449449345, 898113015, 1794954785, 3587852651]

cp's OEIS Frontend

A251143 Number of (n+1) X (2+1) 0..2 arrays with every 2 X 2 subblock summing to 4 and no 2 X 2 subblock having exactly two nonzero entries.

Table of values

List of values