A268321 - cp's OEIS frontend

A268321 Number of length-(n+1) 0..2 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.

n	a(n)
1	2
2	4
3	10
4	25
5	66
6	177
7	485
8	1348
9	3797
10	10812
11	31076
12	90015
13	262432
14	769199
15	2264475
16	6690450
17	19825011
18	58884842
19	175238730
20	522316253
21	1558776782
22	4656673837
23	13922711281
24	41654206400
25	124688153137
26	373402997944
27	1118614401040

[2, 4, 10, 25, 66, 177, 485, 1348, 3797, 10812, 31076, 90015, 262432, 769199, 2264475, 6690450, 19825011, 58884842, 175238730, 522316253, 1558776782, 4656673837, 13922711281, 41654206400, 124688153137, 373402997944, 1118614401040]

cp's OEIS Frontend

A268321 Number of length-(n+1) 0..2 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.

Table of values

List of values