A026378 - cp's OEIS frontend

A026378 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026374 that have s(n)=1; also a(n) = T(2n-1,n-1).

n	a(n)
1	1
2	4
3	17
4	75
5	339
6	1558
7	7247
8	34016
9	160795
10	764388
11	3650571
12	17501619
13	84179877
14	406020930
15	1963073865
16	9511333155
17	46169418195
18	224484046660
19	1093097083475
20	5329784874185
21	26018549129545
22	127154354598330
23	622031993807565

[1, 4, 17, 75, 339, 1558, 7247, 34016, 160795, 764388, 3650571, 17501619, 84179877, 406020930, 1963073865, 9511333155, 46169418195, 224484046660, 1093097083475, 5329784874185, 26018549129545, 127154354598330, 622031993807565]

cp's OEIS Frontend

A026378 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026374 that have s(n)=1; also a(n) = T(2n-1,n-1).

Table of values

List of values