A026387 - cp's OEIS frontend

A026387 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=0; also a(n) = T(2n,n).

n	a(n)
0	2
1	8
2	34
3	150
4	678
5	3116
6	14494
7	68032
8	321590
9	1528776
10	7301142
11	35003238
12	168359754
13	812041860
14	3926147730
15	19022666310
16	92338836390
17	448968093320
18	2186194166950
19	10659569748370
20	52037098259090
21	254308709196660

[2, 8, 34, 150, 678, 3116, 14494, 68032, 321590, 1528776, 7301142, 35003238, 168359754, 812041860, 3926147730, 19022666310, 92338836390, 448968093320, 2186194166950, 10659569748370, 52037098259090, 254308709196660]

cp's OEIS Frontend

A026387 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=0; also a(n) = T(2n,n).

Table of values

List of values