A276605 After a(0)=0, the first differences of A276603.

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

Offset

0,4

Links

Antti Karttunen, Table of n, a(n) for n = 0..6250

Formula

a(n) = A276604(n) / 2.

a(0) = 0; for n >= 1, a(n) = A276603(n) - A276603(n-1).

Prog

(Scheme, two alternatives)
(define (A276605 n) (/ (A276604 n) 2))
(define (A276605 n) (if (zero? n) n (- (A276603 n) (A276603 (- n 1)))))

Crossrefs

Cf. A276603, A276604, A276623.

Sequence in context: A092332 A092334 A269971 * A047060 A050167 A047050

Adjacent sequences: A276602 A276603 A276604 * A276606 A276607 A276608

Keyword

nonn,base

Author

Antti Karttunen, Sep 11 2016

Status

approved