A266930 - cp's OEIS frontend

A266930 Number of n X 3 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

n	a(n)
1	2
2	4
3	9
4	20
5	44
6	92
7	182
8	340
9	605
10	1028
11	1680
12	2651
13	4058
14	6045
15	8793
16	12518
17	17484
18	24001
19	32438
20	43222
21	56853
22	73901
23	95024
24	120965
25	152570
26	190786
27	236681
28	291440
29	356388
30	432986
31	522854
32	627768
33	749685
34	890738
35	1053264
36	1239799
37	1453106

[2, 4, 9, 20, 44, 92, 182, 340, 605, 1028, 1680, 2651, 4058, 6045, 8793, 12518, 17484, 24001, 32438, 43222, 56853, 73901, 95024, 120965, 152570, 190786, 236681, 291440, 356388, 432986, 522854, 627768, 749685, 890738, 1053264, 1239799, 1453106]

cp's OEIS Frontend

A266930 Number of n X 3 binary arrays with rows lexicographically nondecreasing and columns lexicographically nondecreasing and row sums nondecreasing and column sums nonincreasing.

Table of values

List of values