A113873 - cp's OEIS frontend

A113873 a(3n) = a(3n-1) + a(3n-2), a(3n+1) = 2n*a(3n) + a(3n-1), a(3n+2) = a(3n+1) + a(3n).

n	a(n)
0	1
1	1
2	2
3	3
4	8
5	11
6	19
7	87
8	106
9	193
10	1264
11	1457
12	2721
13	23225
14	25946
15	49171
16	517656
17	566827
18	1084483
19	13580623
20	14665106
21	28245729
22	410105312
23	438351041
24	848456353
25	14013652689
26	14862109042
27	28875761731
28	534625820200

[1, 1, 2, 3, 8, 11, 19, 87, 106, 193, 1264, 1457, 2721, 23225, 25946, 49171, 517656, 566827, 1084483, 13580623, 14665106, 28245729, 410105312, 438351041, 848456353, 14013652689, 14862109042, 28875761731, 534625820200]

cp's OEIS Frontend

A113873 a(3n) = a(3n-1) + a(3n-2), a(3n+1) = 2n*a(3n) + a(3n-1), a(3n+2) = a(3n+1) + a(3n).

Table of values

List of values