A277904 Irregular table: row n (n >= 0) is obtained by listing numbers 0 .. A018819(n)-1.

0, 0, 0, 1, 0, 1, 0, 1, 2, 3, 0, 1, 2, 3, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19

Offset: 1

Author

Antti Karttunen, Nov 14 2016

Keywords

• nonn
• tabf

Examples

			A018819 -> range -> terms on row n
  1        [0,0]:    0;
  1        [0,0]:    0;
  2        [0,1]:    0, 1;
  2        [0,1]:    0, 1;
  4        [0,3]:    0, 1, 2, 3;
  4        [0,3]:    0, 1, 2, 3;
  6        [0,5]:    0, 1, 2, 3, 4, 5;
etc.
		

Links

• Antti Karttunen, Table of n, a(n) for n = 1..9828

Crossrefs

Cf. A000123, A018819, A277903.

Used for constructing A277905.

Retaining only every second row gives A278164.

Programs

Scheme

(define (A277904 n) (if (= 1 n) 0 (- n (A000123 (+ -1 (A277903 n))) 1)))

Formula

a(1) = 0; for n > 1, a(n) = n - A000123(A277903(n)-1) - 1.