A067000 - cp's OEIS frontend

A067000 a(1) = 1; a(n) = Sum (n+k)!a(k)/(2k)!, k = 1..n-1.

n	a(n)
1	1
2	3
3	27
4	339
5	5553
6	112761
7	2736099
8	77252175
9	2488315257
10	90053238033
11	3617791773723
12	159761716507215
13	7692231450102849
14	401057043646065345
15	22510943881422758739
16	1353385233080839510335
17	86771327488839208390473

[1, 3, 27, 339, 5553, 112761, 2736099, 77252175, 2488315257, 90053238033, 3617791773723, 159761716507215, 7692231450102849, 401057043646065345, 22510943881422758739, 1353385233080839510335, 86771327488839208390473]

cp's OEIS Frontend

A067000 a(1) = 1; a(n) = Sum (n+k)!a(k)/(2k)!, k = 1..n-1.

Table of values

List of values