A001475 - cp's OEIS frontend

A001475 a(n) = a(n-1) + n * a(n-2), where a(1) = 1, a(2) = 2.

n	a(n)
1	1
2	2
3	5
4	13
5	38
6	116
7	382
8	1310
9	4748
10	17848
11	70076
12	284252
13	1195240
14	5174768
15	23103368
16	105899656
17	498656912
18	2404850720
19	11879332048
20	59976346448
21	309442319456
22	1628921941312
23	8746095288800
24	47840221880288
25	266492604100288
26	1510338372987776

[1, 2, 5, 13, 38, 116, 382, 1310, 4748, 17848, 70076, 284252, 1195240, 5174768, 23103368, 105899656, 498656912, 2404850720, 11879332048, 59976346448, 309442319456, 1628921941312, 8746095288800, 47840221880288, 266492604100288, 1510338372987776]

cp's OEIS Frontend

A001475 a(n) = a(n-1) + n * a(n-2), where a(1) = 1, a(2) = 2.

Table of values

List of values