A295571 a(n) = A081881(n) - 1.

0, 1, 3, 9, 25, 68, 185, 503, 1368, 3719, 10110, 27482, 74704, 203067, 551994, 1500476, 4078717, 11087103, 30137871, 81923227, 222690420, 605335322, 1645472006, 4472856654, 12158484964, 33050188740, 89839727479, 244209698680, 663830786256, 1804479163452, 4905082919845

Offset

1,3

Comments

The blocks of fractions described in A081881 extend from 1/A081881(k) through 1/a(k+1) and contain A295572(k) terms. For example the third block is 1/4 + 1/5 + 1/6 + 1/7 + 1/8 + 1/6 and has length 6.

Links

Jinyuan Wang, Table of n, a(n) for n = 1..1000

Crossrefs

Cf. A081881, A295572.

Sequence in context: A226710 A306928 A094292 * A291019 A236570 A338726

Adjacent sequences: A295568 A295569 A295570 * A295572 A295573 A295574

Keyword

nonn

Author

N. J. A. Sloane, Nov 30 2017

Extensions

More terms from Jinyuan Wang, Feb 20 2020

Status

approved