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A048216
a(n) = T(n,n), where array T is given by A048212.
1
2, 3, 7, 13, 21, 30, 42, 57, 73, 93, 115, 139, 164, 190, 222, 255, 289, 326, 364, 405, 450, 497, 545, 598, 654, 713, 774, 836, 900, 968, 1037, 1111, 1187, 1264, 1342, 1423, 1507, 1594, 1682, 1771, 1867, 1965, 2065, 2168, 2273, 2379
OFFSET
1,1
COMMENTS
a(1) = 2, a(2) = 3 and a(i) is the next smallest number greater than a(i-1) such that a(i) - a(j) is not a(1) or a(m) or a(m) - a(n) with 1 <= j < i, 1 <= n < m < i. - Ben Paul Thurston, Feb 18 2019
FORMULA
a(n) = A004979(n + 1) - 1. - Sean A. Irvine, Jun 05 2021
CROSSREFS
Sequence in context: A070754 A325875 A049887 * A003509 A238432 A238423
KEYWORD
nonn
STATUS
approved