A067120 - cp's OEIS frontend

A067120 a(n) = floor(X/Y) where X = concatenation of first n odd numbers in increasing order and Y = n-th triangular number.

n	a(n)
1	1
2	4
3	22
4	135
5	905
6	64662
7	4849682
8	377197536
9	30175802922
10	2468929330031
11	205744110835938
12	17409117070733232
13	1492210034634277058
14	129324869668304011738
15	11315926095976601027106
16	998464067292053031803477
17	88752361537071380604753549
18	7941000769106386685688475516

[1, 4, 22, 135, 905, 64662, 4849682, 377197536, 30175802922, 2468929330031, 205744110835938, 17409117070733232, 1492210034634277058, 129324869668304011738, 11315926095976601027106, 998464067292053031803477, 88752361537071380604753549, 7941000769106386685688475516]

cp's OEIS Frontend

A067120 a(n) = floor(X/Y) where X = concatenation of first n odd numbers in increasing order and Y = n-th triangular number.

Table of values

List of values