A266931 - cp's OEIS frontend

A266931 Number of n X 4 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

n	a(n)
1	2
2	5
3	12
4	35
5	100
6	288
7	794
8	2077
9	5110
10	11869
11	26086
12	54543
13	108999
14	209148
15	386883
16	692473
17	1203061
18	2034487
19	3357115
20	5416951
21	8563297
22	13284702
23	20254831
24	30390893
25	44926915
26	65505045
27	94288435
28	134099783
29	188589873
30	262441858

[2, 5, 12, 35, 100, 288, 794, 2077, 5110, 11869, 26086, 54543, 108999, 209148, 386883, 692473, 1203061, 2034487, 3357115, 5416951, 8563297, 13284702, 20254831, 30390893, 44926915, 65505045, 94288435, 134099783, 188589873, 262441858]

cp's OEIS Frontend

A266931 Number of n X 4 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

Table of values

List of values