A108453 - cp's OEIS frontend

A108453 Number of pyramids of the first kind 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 of the first kind is a sequence u^pd^p for some positive integer p, starting at the x-axis).

n	a(n)
1	1
2	5
3	29
4	201
5	1561
6	13005
7	113525
8	1024593
9	9482097
10	89488213
11	857952525
12	8332513689
13	81805985033
14	810551503005
15	8094740040677
16	81395917522849
17	823405075135457
18	8374004486010277
19	85567502052729597
20	878066090712156521

[1, 5, 29, 201, 1561, 13005, 113525, 1024593, 9482097, 89488213, 857952525, 8332513689, 81805985033, 810551503005, 8094740040677, 81395917522849, 823405075135457, 8374004486010277, 85567502052729597, 878066090712156521]

cp's OEIS Frontend

A108453 Number of pyramids of the first kind 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 of the first kind is a sequence u^pd^p for some positive integer p, starting at the x-axis).

Table of values

List of values