A178446 - cp's OEIS frontend

A178446 Number of perfect matchings in the n X n X n triangular grid, reduced by the spire vertex if n mod 4 equals 1 or 2.

n	a(n)
0	1
1	1
2	1
3	2
4	6
5	28
6	200
7	2196
8	37004
9	957304
10	38016960
11	2317631400
12	216893681800
13	31159166587056
14	6871649018572800
15	2326335506123418128
16	1208982377794384163088
17	964503557426086478029152
18	1181201363574177619007442944
19	2220650888749669503773432361504
20	6408743336016148761893699822360672

[1, 1, 1, 2, 6, 28, 200, 2196, 37004, 957304, 38016960, 2317631400, 216893681800, 31159166587056, 6871649018572800, 2326335506123418128, 1208982377794384163088, 964503557426086478029152, 1181201363574177619007442944, 2220650888749669503773432361504, 6408743336016148761893699822360672]

cp's OEIS Frontend

A178446 Number of perfect matchings in the n X n X n triangular grid, reduced by the spire vertex if n mod 4 equals 1 or 2.

Table of values

List of values