A033504 - cp's OEIS frontend

A033504 a(n)/4^n is the expected number of tosses of a coin required to obtain n+1 heads or n+1 tails.

n	a(n)
0	1
1	10
2	66
3	372
4	1930
5	9516
6	45332
7	210664
8	960858
9	4319100
10	19188796
11	84438360
12	368603716
13	1598231992
14	6889682280
15	29551095248
16	126193235194
17	536799072924
18	2275560109868
19	9616650989560
20	40527780684972
21	170368957887656
22	714556104675736
23	2990728476330672

[1, 10, 66, 372, 1930, 9516, 45332, 210664, 960858, 4319100, 19188796, 84438360, 368603716, 1598231992, 6889682280, 29551095248, 126193235194, 536799072924, 2275560109868, 9616650989560, 40527780684972, 170368957887656, 714556104675736, 2990728476330672]

cp's OEIS Frontend

A033504 a(n)/4^n is the expected number of tosses of a coin required to obtain n+1 heads or n+1 tails.

Table of values

List of values