A261646 Row lengths in A261644.

1, 1, 1, 3, 5, 7, 15, 27, 49, 90, 171, 326, 613, 1174, 2255, 4333, 8386, 16213, 31457, 61097, 118577, 230322, 447767, 870570, 1693887, 3297343, 6423347, 12523562, 24435171, 47707012, 93215393, 182260604, 356622869, 698284551, 1368195878, 2682527954, 5262729874, 10330704931

Offset

1,4

Comments

First differences of A261396;

also row lengths in A261712.

Links

Table of n, a(n) for n=1..38.

Formula

a(n) = A261396(n) - A261396(n-1).

Prog

(Haskell)
a261646 = length . a261644_row

Crossrefs

Cf. A261644, A261712, A261396.

Sequence in context: A166093 A165785 A362057 * A303027 A217615 A334084

Adjacent sequences: A261643 A261644 A261645 * A261647 A261648 A261649

Keyword

nonn

Author

Reinhard Zumkeller, Aug 31 2015

Extensions

a(21)-a(38) from Chai Wah Wu, Aug 31 2015

Status

approved