A080500 - cp's OEIS frontend

A080500 a(n) = (n-1)(n-4)(n-9)...(n-k^2) where k^2 < n <= (k+1)^2.

n	a(n)
1	1
2	1
3	2
4	3
5	4
6	10
7	18
8	28
9	40
10	54
11	140
12	264
13	432
14	650
15	924
16	1260
17	1664
18	4284
19	8100
20	13376
21	20400
22	29484
23	40964
24	55200
25	72576
26	93500
27	236808
28	443232
29	728000
30	1108380
31	1603800
32	2235968
33	3028992
34	4009500
35	5206760
36	6652800
37	8382528
38	20867704

[1, 1, 2, 3, 4, 10, 18, 28, 40, 54, 140, 264, 432, 650, 924, 1260, 1664, 4284, 8100, 13376, 20400, 29484, 40964, 55200, 72576, 93500, 236808, 443232, 728000, 1108380, 1603800, 2235968, 3028992, 4009500, 5206760, 6652800, 8382528, 20867704]

cp's OEIS Frontend

A080500 a(n) = (n-1)(n-4)(n-9)...(n-k^2) where k^2 < n <= (k+1)^2.

Table of values

List of values