A007226 - cp's OEIS frontend

A007226 a(n) = 2*det(M(n; -1))/det(M(n; 0)), where M(n; m) is the n X n matrix with (i,j)-th element equal to 1/binomial(n + i + j + m, n).

n	a(n)
0	2
1	3
2	10
3	42
4	198
5	1001
6	5304
7	29070
8	163438
9	937365
10	5462730
11	32256120
12	192565800
13	1160346492
14	7048030544
15	43108428198
16	265276342782
17	1641229898525
18	10202773534590
19	63698396932170
20	399223286267190
21	2510857763851185
22	15842014607109600

[2, 3, 10, 42, 198, 1001, 5304, 29070, 163438, 937365, 5462730, 32256120, 192565800, 1160346492, 7048030544, 43108428198, 265276342782, 1641229898525, 10202773534590, 63698396932170, 399223286267190, 2510857763851185, 15842014607109600]

cp's OEIS Frontend

A007226 a(n) = 2*det(M(n; -1))/det(M(n; 0)), where M(n; m) is the n X n matrix with (i,j)-th element equal to 1/binomial(n + i + j + m, n).

Table of values

List of values