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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 (list; graph; refs; listen; history; text; internal format)
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

LINKS

Table of n, a(n) for n=1..46.

CROSSREFS

Cf. A004979, A048212.

Sequence in context: A070754 A325875 A049887 * A003509 A238432 A238423

Adjacent sequences:  A048213 A048214 A048215 * A048217 A048218 A048219

KEYWORD

nonn

AUTHOR

Clark Kimberling

STATUS

approved

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Last modified August 20 01:14 EDT 2019. Contains 326136 sequences. (Running on oeis4.)