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A338031
Triangular array read by rows: T(n,k) = A337656(n) + A337656(k) for 1 <= k <= n.
4
0, 1, 2, 3, 4, 6, 7, 8, 10, 14, 12, 13, 15, 19, 24, 20, 21, 23, 27, 32, 40, 30, 31, 33, 37, 42, 50, 60, 44, 45, 47, 51, 56, 64, 74, 88, 65, 66, 68, 72, 77, 85, 95, 109, 130, 91, 92, 94, 98, 103, 111, 121, 135, 156, 182, 107, 108, 110, 114, 119, 127, 137, 151, 172, 198, 214
OFFSET
1,3
LINKS
Peter Kagey, Table of n, a(n) for n = 1..10011 (first 141 rows, flattened)
EXAMPLE
Addition table begins:
+ | 0 1 3 7 12 20 30 44 65
-----+-----------------------------
0 | 0
1 | 1 2
3 | 3 4 6
7 | 7 8 10 14
12 | 12 13 15 19 24
20 | 20 21 23 27 32 40
30 | 30 31 33 37 42 50 60
44 | 44 45 47 51 56 64 74 88
65 | 65 66 68 72 77 85 95 109 130
CROSSREFS
Cf. A337656, A337657, A338032 (by antidiagonals), A338033 (multiplication).
Sequence in context: A359755 A226038 A181062 * A091199 A093452 A082103
KEYWORD
nonn,tabl
AUTHOR
Peter Kagey, Oct 07 2020
STATUS
approved