A026388 - cp's OEIS frontend

A026388 a(n) is the number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=2; also a(n) = T(2n,n-1).

n	a(n)
1	1
2	5
3	24
4	114
5	541
6	2573
7	12275
8	58747
9	282003
10	1357407
11	6549906
12	31675020
13	153481299
14	745011075
15	3622111560
16	17635418730
17	85975792075
18	419644943495
19	2050493623760
20	10029194506990
21	49098707209695
22	240568930012575

[1, 5, 24, 114, 541, 2573, 12275, 58747, 282003, 1357407, 6549906, 31675020, 153481299, 745011075, 3622111560, 17635418730, 85975792075, 419644943495, 2050493623760, 10029194506990, 49098707209695, 240568930012575]

cp's OEIS Frontend

A026388 a(n) is the number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=2; also a(n) = T(2n,n-1).

Table of values

List of values