A206229 - cp's OEIS frontend

A206229 a(n) = [x^n] Product_{k=1..n} (1 + x^k)^(n-k+1).

n	a(n)
0	1
1	1
2	2
3	8
4	31
5	124
6	515
7	2166
8	9182
9	39195
10	168216
11	725043
12	3136223
13	13606891
14	59187790
15	258034685
16	1127137141
17	4932071321
18	21614913239
19	94859273448
20	416820578198
21	1833626307670
22	8074598332650
23	35591081565244
24	157013886785417
25	693237405812328

[1, 1, 2, 8, 31, 124, 515, 2166, 9182, 39195, 168216, 725043, 3136223, 13606891, 59187790, 258034685, 1127137141, 4932071321, 21614913239, 94859273448, 416820578198, 1833626307670, 8074598332650, 35591081565244, 157013886785417, 693237405812328]

cp's OEIS Frontend

A206229 a(n) = [x^n] Product_{k=1..n} (1 + x^k)^(n-k+1).

Table of values

List of values