A210257 - cp's OEIS frontend

A210257 Construct a triangle with centered rows in which row n contains n copies of n; form the componentwise sum of the first n rows and concatenate these decimal numbers to get a(n).

n	a(n)
1	1
2	212
3	32423
4	4364634
5	548696845
6	651081291281056
7	7612101512161215101267
8	87141218152016201518121478
9	981614211824202520241821141689
10	109181624212824302530242821241618910

[1, 212, 32423, 4364634, 548696845, 651081291281056, 7612101512161215101267, 87141218152016201518121478, 981614211824202520241821141689, 109181624212824302530242821241618910]

cp's OEIS Frontend

A210257 Construct a triangle with centered rows in which row n contains n copies of n; form the componentwise sum of the first n rows and concatenate these decimal numbers to get a(n).

Table of values

List of values