A026014 - cp's OEIS frontend

A026014 a(n) = number of (s(0), s(1), ..., s(2n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 2, s(2n) = 6. Also a(n) = T(2n,n-2), where T is the array defined in A026009.

n	a(n)
2	1
3	6
4	28
5	119
6	483
7	1911
8	7448
9	28764
10	110466
11	422807
12	1615152
13	6163885
14	23514855
15	89714835
16	342411120
17	1307613480
18	4997082510
19	19111589280
20	73154916744
21	280265589198
22	1074685552094
23	4124573481446
24	15843809385168
25	60914041121640

[1, 6, 28, 119, 483, 1911, 7448, 28764, 110466, 422807, 1615152, 6163885, 23514855, 89714835, 342411120, 1307613480, 4997082510, 19111589280, 73154916744, 280265589198, 1074685552094, 4124573481446, 15843809385168, 60914041121640]

cp's OEIS Frontend

A026014 a(n) = number of (s(0), s(1), ..., s(2n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 2, s(2n) = 6. Also a(n) = T(2n,n-2), where T is the array defined in A026009.

Table of values

List of values