A008608 - cp's OEIS frontend

A008608 Number of n X n upper triangular matrices A of nonnegative integers such that a_1i + a_2i + ... + a_{i-1,i} - a_ii - a_{i,i+1} - ... - a_in = -1.

n	a(n)
1	1
2	2
3	7
4	40
5	357
6	4820
7	96030
8	2766572
9	113300265
10	6499477726
11	515564231770
12	55908184737696
13	8203615387086224
14	1613808957720017838
15	422045413500096791377
16	145606442599303799948900
17	65801956684134601408784992
18	38698135339344702725297294600
19	29437141738828506134939056167071
20	28800381656420765181010517468370560

[1, 2, 7, 40, 357, 4820, 96030, 2766572, 113300265, 6499477726, 515564231770, 55908184737696, 8203615387086224, 1613808957720017838, 422045413500096791377, 145606442599303799948900, 65801956684134601408784992, 38698135339344702725297294600, 29437141738828506134939056167071, 28800381656420765181010517468370560]

cp's OEIS Frontend

A008608 Number of n X n upper triangular matrices A of nonnegative integers such that a_1i + a_2i + ... + a_{i-1,i} - a_ii - a_{i,i+1} - ... - a_in = -1.

Table of values

List of values