A026389 - cp's OEIS frontend

A026389 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=4; also a(n) = T(2n,n-2).

n	a(n)
2	1
3	8
4	49
5	272
6	1440
7	7428
8	37730
9	189808
10	948909
11	4724160
12	23453001
13	116207424
14	575036475
15	2842936320
16	14046869575
17	69378730880
18	342590699955
19	1691519468760
20	8351553940355
21	41235710124400
22	203617691311370
23	1005560117623204

[1, 8, 49, 272, 1440, 7428, 37730, 189808, 948909, 4724160, 23453001, 116207424, 575036475, 2842936320, 14046869575, 69378730880, 342590699955, 1691519468760, 8351553940355, 41235710124400, 203617691311370, 1005560117623204]

cp's OEIS Frontend

A026389 a(n) = number of integer strings s(0),...,s(n) counted by array T in A026386 that have s(n)=4; also a(n) = T(2n,n-2).

Table of values

List of values