A108450 - cp's OEIS frontend

A108450 Number of pyramids in all paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) (a pyramid is a sequence u^pd^p or U^pd^(2p) for some positive integer p, starting at the x-axis).

n	a(n)
1	2
2	10
3	58
4	402
5	3122
6	26010
7	227050
8	2049186
9	18964194
10	178976426
11	1715905050
12	16665027378
13	163611970066
14	1621103006010
15	16189480081354
16	162791835045698
17	1646810150270914
18	16748008972020554
19	171135004105459194

[2, 10, 58, 402, 3122, 26010, 227050, 2049186, 18964194, 178976426, 1715905050, 16665027378, 163611970066, 1621103006010, 16189480081354, 162791835045698, 1646810150270914, 16748008972020554, 171135004105459194]

cp's OEIS Frontend

A108450 Number of pyramids in all paths from (0,0) to (3n,0) that stay in the first quadrant (but may touch the horizontal axis), consisting of steps u=(2,1), U=(1,2), or d=(1,-1) (a pyramid is a sequence u^pd^p or U^pd^(2p) for some positive integer p, starting at the x-axis).

Table of values

List of values