A225976 - cp's OEIS frontend

A225976 Number of n X 2 binary arrays whose sum with another n X 2 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order.

n	a(n)
1	4
2	15
3	48
4	138
5	350
6	790
7	1616
8	3049
9	5384
10	9001
11	14376
12	22092
13	32850
14	47480
15	66952
16	92387
17	125068
18	166451
19	218176
20	282078
21	360198
22	454794
23	568352
24	703597
25	863504
26	1051309
27	1270520
28	1524928
29	1818618
30	2155980
31	2541720
32	2980871
33	3478804
34	4041239

[4, 15, 48, 138, 350, 790, 1616, 3049, 5384, 9001, 14376, 22092, 32850, 47480, 66952, 92387, 125068, 166451, 218176, 282078, 360198, 454794, 568352, 703597, 863504, 1051309, 1270520, 1524928, 1818618, 2155980, 2541720, 2980871, 3478804, 4041239]

cp's OEIS Frontend

A225976 Number of n X 2 binary arrays whose sum with another n X 2 binary array containing no more than two 1s has rows and columns in lexicographically nondecreasing order.

Table of values

List of values