A298419 - cp's OEIS frontend

A298419 a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.

n	a(n)
0	1
1	1
2	1
3	3
4	12
5	58
6	339
7	2318
8	18217
9	161647
10	1598311
11	17419832
12	207440012
13	2679300663
14	37302771588
15	556862275475
16	8872493654229
17	150275529864635
18	2696087044070848
19	51075378307643124
20	1018811479110389943
21	21343965683012143990
22	468548433547174197669

[1, 1, 1, 3, 12, 58, 339, 2318, 18217, 161647, 1598311, 17419832, 207440012, 2679300663, 37302771588, 556862275475, 8872493654229, 150275529864635, 2696087044070848, 51075378307643124, 1018811479110389943, 21343965683012143990, 468548433547174197669]

cp's OEIS Frontend

A298419 a(n) = n*a(n-1) - a(n-2) + a([n/2]), where a(0) = 1, a(1) = 1, a(2) = 1.

Table of values

List of values