A123764 - cp's OEIS frontend

A123764 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position.

n	a(n)
1	1
2	2
3	7
4	24
5	99
6	416
7	1854
8	8407
9	38970
10	182742
11	866442
12	4140607
13	19925401
14	96430625
15	469005432
16	2290860538
17	11232074043
18	55255074216
19	272634835875
20	1348823736479
21	6689314884962
22	33247860759418
23	165583649067958
24	826170069700588
25	4129098732200830

[1, 2, 7, 24, 99, 416, 1854, 8407, 38970, 182742, 866442, 4140607, 19925401, 96430625, 469005432, 2290860538, 11232074043, 55255074216, 272634835875, 1348823736479, 6689314884962, 33247860759418, 165583649067958, 826170069700588, 4129098732200830]

cp's OEIS Frontend

A123764 Number of ways, counted up to symmetry, to build a contiguous building with n LEGO blocks of size 1 X 2 which is flat, i.e., with all blocks in parallel position.

Table of values

List of values