A379905 - cp's OEIS frontend

A379905 Rank of the permutation resulting from a pre-order traversal of a binary tree which is complete except for the final row and has vertices numbered 0 to n-1.

n	a(n)
1	0
2	0
3	0
4	1
5	3
6	8
7	30
8	222
9	1302
10	8442
11	63570
12	545473
13	5249163
14	55941128
15	653682990
16	8597126190
17	117809490990
18	1730350233390
19	27183297753390
20	454752069221550
21	8070074352360750
22	151403473011001710
23	2993918729983972590
24	62232717584055513822
25	1356493891878893498262

[0, 0, 0, 1, 3, 8, 30, 222, 1302, 8442, 63570, 545473, 5249163, 55941128, 653682990, 8597126190, 117809490990, 1730350233390, 27183297753390, 454752069221550, 8070074352360750, 151403473011001710, 2993918729983972590, 62232717584055513822, 1356493891878893498262]

cp's OEIS Frontend

A379905 Rank of the permutation resulting from a pre-order traversal of a binary tree which is complete except for the final row and has vertices numbered 0 to n-1.

Table of values

List of values