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A374791
Irregular triangle T(n, k), n >= 0, k = 1..A120880(n), read by rows; the n-th lists the integers m such that A374560(m) = n.
3
0, 1, 2, 4, 3, 5, 6, 7, 8, 9, 11, 13, 12, 17, 18, 24, 10, 14, 15, 16, 19, 20, 22, 26, 21, 23, 25, 27, 28, 29, 30, 31, 32, 33, 34, 35, 37, 39, 41, 43, 38, 42, 47, 48, 51, 52, 58, 62, 40, 49, 50, 60, 59, 61, 70, 71, 72, 73, 83, 85, 84, 97, 98, 112, 36, 44, 45, 46, 53, 54
OFFSET
0,3
COMMENTS
A374560 corresponds to a square array, but we consider it here as a flat sequence (when its values are read according along its antidiagonals).
As a flat sequence, this is a permutation of the nonnegative integers with inverse A374792.
EXAMPLE
Triangle T(n, k) begins:
n n-th row
-- ------------------------------
0 0
1 1, 2
2 4
3 3, 5
4 6, 7, 8, 9
5 11, 13
6 12
7 17, 18
8 24
9 10, 14
10 15, 16, 19, 20
11 22, 26
12 21, 23, 25, 27
13 28, 29, 30, 31, 32, 33, 34, 35
14 37, 39, 41, 43
15 38, 42
PROG
(PARI) \\ See Links section.
CROSSREFS
Cf. A120880, A374560, A374792 (inverse).
Sequence in context: A081725 A228083 A222234 * A374792 A362075 A131042
KEYWORD
nonn,tabl,base
AUTHOR
Rémy Sigrist, Jul 20 2024
STATUS
approved