A212507 - cp's OEIS frontend

A212507 Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z.

n	a(n)
0	0
1	1
2	12
3	56
4	168
5	399
6	810
7	1480
8	2496
9	3965
10	6000
11	8736
12	12312
13	16891
14	22638
15	29744
16	38400
17	48825
18	61236
19	75880
20	93000
21	112871
22	135762
23	161976
24	191808
25	225589
26	263640
27	306320
28	353976
29	406995
30	465750
31	530656
32	602112
33	680561
34	766428

[0, 1, 12, 56, 168, 399, 810, 1480, 2496, 3965, 6000, 8736, 12312, 16891, 22638, 29744, 38400, 48825, 61236, 75880, 93000, 112871, 135762, 161976, 191808, 225589, 263640, 306320, 353976, 406995, 465750, 530656, 602112, 680561, 766428]

cp's OEIS Frontend

A212507 Number of (w,x,y,z) with all terms in {1,...,n} and w<2x and y<=2z.

Table of values

List of values