A081698 - cp's OEIS frontend

A081698 Expansion of (1 - sqrt( 1 - 4xsqrt( 1 + 4x )) )/( 2x ).

n	a(n)
0	1
1	3
2	4
3	21
4	56
5	282
6	984
7	4813
8	19280
9	93150
10	403672
11	1945954
12	8845360
13	42766292
14	200419504
15	974134461
16	4659558048
17	22785183670
18	110564976792
19	543935554390
20	2667398588272
21	13196971915628
22	65238895435792
23	324431740601618
24	1614044041864800
25	8063536826420460

[1, 3, 4, 21, 56, 282, 984, 4813, 19280, 93150, 403672, 1945954, 8845360, 42766292, 200419504, 974134461, 4659558048, 22785183670, 110564976792, 543935554390, 2667398588272, 13196971915628, 65238895435792, 324431740601618, 1614044041864800, 8063536826420460]

cp's OEIS Frontend

A081698 Expansion of (1 - sqrt( 1 - 4xsqrt( 1 + 4x )) )/( 2x ).

Table of values

List of values

cp's OEIS Frontend

A081698 Expansion of (1 - sqrt( 1 - 4*x*sqrt( 1 + 4*x )) )/( 2*x ).

Table of values

List of values

A081698 Expansion of (1 - sqrt( 1 - 4xsqrt( 1 + 4x )) )/( 2x ).