A373755 - cp's OEIS frontend

A373755 a(n) = A205497(n, floor((n - 1) / 2)). The middle coefficients of the Eulerian zig-zag polynomials.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	7
6	31
7	109
8	623
9	2951
10	20641
11	123216
12	1019051
13	7349140
14	70148989
15	593513485
16	6421463423
17	62382094567
18	754405836811
19	8277393686747
20	110644077164479
21	1353422057172923
22	19814920352425441
23	267391099520321166
24	4255291684449288503
25	62800765220575811118

[1, 1, 1, 1, 3, 7, 31, 109, 623, 2951, 20641, 123216, 1019051, 7349140, 70148989, 593513485, 6421463423, 62382094567, 754405836811, 8277393686747, 110644077164479, 1353422057172923, 19814920352425441, 267391099520321166, 4255291684449288503, 62800765220575811118]

cp's OEIS Frontend

A373755 a(n) = A205497(n, floor((n - 1) / 2)). The middle coefficients of the Eulerian zig-zag polynomials.

Table of values

List of values