A278164 Irregular triangle read by rows: row n (n >= 0) is obtained by listing numbers 0 .. A000123(n)-1.

0, 0, 1, 0, 1, 2, 3, 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, 10, 11, 12, 13, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

Offset: 1

Author

Antti Karttunen, Nov 15 2016

Keywords

• nonn
• tabf

Examples

			A000123 -> range -> terms on row n
   1       [0,0]:    0;
   2       [0,1]:    0, 1;
   4       [0,3]:    0, 1, 2, 3;
   6       [0,5]:    0, 1, 2, 3, 4, 5;
  10       [0,9]:    0, 1, 2, 3, 4, 5, 6, 7, 8, 9;
etc.
		

Links

• Antti Karttunen, Table of n, a(n) for n = 1..9669

Crossrefs

Obtained by taking the every second row of similar table A277904.

Cf. A000123, A131205, A278163.

Programs

Scheme

(define (A278164 n) (if (= 1 n) 0 (- n (A131205 (A278163 n)) 1)))

Formula

a(1) = 0; for n > 1, a(n) = n - A131205(A278163(n)) - 1.