A057516 Number of sea-level valleys in Catalan mountain ranges encoded by A014486.

0, 0, 1, 0, 2, 1, 1, 0, 0, 3, 2, 2, 1, 1, 2, 1, 1, 0, 0, 1, 0, 0, 0, 4, 3, 3, 2, 2, 3, 2, 2, 1, 1, 2, 1, 1, 1, 3, 2, 2, 1, 1, 2, 1, 1, 0, 0, 1, 0, 0, 0, 2, 1, 1, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 0, 5, 4, 4, 3, 3, 4, 3, 3, 2, 2, 3, 2, 2, 2, 4, 3, 3, 2, 2, 3, 2, 2, 1, 1, 2, 1, 1, 1, 3, 2, 2, 1, 1, 2, 1, 1, 1, 2, 1, 1

Offset

0,5

Links

Table of n, a(n) for n=0..104.

Formula

a(0) = 0, a(n) = card(binexp2pars(A014486(n)))-1 = A057515(n)-1.

Crossrefs

Cf. A057514.

Sequence in context: A292894 A147701 A228348 * A293015 A293119 A293133

Adjacent sequences: A057513 A057514 A057515 * A057517 A057518 A057519

Keyword

nonn

Author

Antti Karttunen, Sep 03 2000

Status

approved