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URL: https://oeis.org/A278164

⇱ A278164 - OEIS

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A278164
Irregular triangle read by rows: row n (n >= 0) is obtained by listing numbers 0 .. A000123(n)-1.
3
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
1,6
LINKS
FORMULA
a(1) = 0; for n > 1, a(n) = n - A131205(A278163(n)) - 1.
EXAMPLE
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.
PROG
(Scheme) (define (A278164 n) (if (= 1 n) 0 (- n (A131205 (A278163 n)) 1)))
CROSSREFS
Obtained by taking the every second row of similar table A277904.
Sequence in context: A049263 A014588 A293497 * A328480 A279681 A053645
KEYWORD
nonn,tabf
AUTHOR
Antti Karttunen, Nov 15 2016
STATUS
approved