A193472 - cp's OEIS frontend

A193472 Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

n	a(n)
0	1
1	1
2	1
3	3
4	1
5	25
6	1
7	427
8	1
9	12465
10	5
11	555731
12	691
13	35135945
14	7
15	2990414715
16	3617
17	329655706465
18	43867
19	45692713833379
20	174611
21	1111113564712575
22	854513
23	1595024111042171723
24	236364091
25	387863354088927172625
26	8553103
27	110350957750914345093747
28	23749461029

[1, 1, 1, 3, 1, 25, 1, 427, 1, 12465, 5, 555731, 691, 35135945, 7, 2990414715, 3617, 329655706465, 43867, 45692713833379, 174611, 1111113564712575, 854513, 1595024111042171723, 236364091, 387863354088927172625, 8553103, 110350957750914345093747, 23749461029]

cp's OEIS Frontend

A193472 Numerator of ez(n-1)*n!/(4^n-2^n) where ez(n) is the n-th coefficient of sec(t)+tan(t) for n>0, a(0) = 1.

Table of values

List of values