A055790 - cp's OEIS frontend

A055790 a(n) = na(n-1) + (n-2)a(n-2), a(0) = 0, a(1) = 2.

n	a(n)
0	0
1	2
2	4
3	14
4	64
5	362
6	2428
7	18806
8	165016
9	1616786
10	17487988
11	206918942
12	2657907184
13	36828901754
14	547499510764
15	8691268384262
16	146725287298888
17	2624698909845026
18	49592184973992676
19	986871395973226286
20	20630087248996393888
21	451982388752415571082

[0, 2, 4, 14, 64, 362, 2428, 18806, 165016, 1616786, 17487988, 206918942, 2657907184, 36828901754, 547499510764, 8691268384262, 146725287298888, 2624698909845026, 49592184973992676, 986871395973226286, 20630087248996393888, 451982388752415571082]

cp's OEIS Frontend

A055790 a(n) = na(n-1) + (n-2)a(n-2), a(0) = 0, a(1) = 2.

Table of values

List of values

cp's OEIS Frontend

A055790 a(n) = n*a(n-1) + (n-2)*a(n-2), a(0) = 0, a(1) = 2.

Table of values

List of values

A055790 a(n) = na(n-1) + (n-2)a(n-2), a(0) = 0, a(1) = 2.