A048216 a(n) = T(n,n), where array T is given by A048212.

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

Links

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

Formula

a(n) = A004979(n + 1) - 1. - Sean A. Irvine, Jun 05 2021

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