A046574 - cp's OEIS frontend

A046574 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

n	a(n)
1	1
2	4
3	5
4	2
5	19
6	35
7	259
8	483
9	1815
10	6864
11	52195
12	99671
13	382109
14	1469650
15	5668327
16	21915550
17	84913470
18	329624730
19	2563431075
20	4991324415
21	19463777025
22	75992317170
23	297026449005
24	1162147683450
25	4551257541090
26	17839099909800

[1, 4, 5, 2, 19, 35, 259, 483, 1815, 6864, 52195, 99671, 382109, 1469650, 5668327, 21915550, 84913470, 329624730, 2563431075, 4991324415, 19463777025, 75992317170, 297026449005, 1162147683450, 4551257541090, 17839099909800]

cp's OEIS Frontend

A046574 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

Table of values

List of values