A299776 a(n) = 1 + 4*(A160120(n) - 1)/3.

0, 1, 5, 9, 21, 25, 37, 49, 77, 89, 101, 113, 141, 161, 189, 225, 293, 329, 341, 353, 381, 401, 429, 465, 533, 577, 605, 641, 709, 777, 853, 945, 1101, 1209, 1237, 1249, 1277, 1297, 1325, 1361, 1429, 1473, 1501, 1537, 1605, 1673, 1749, 1841, 1997, 2113, 2157

Offset: 0

Author

Omar E. Pol, Apr 03 2018

Keywords

• nonn

Comments

Essentially this should be the 120-degree wedge of the cellular automaton of A160120 projected in four quadrants.

First differs from both A147552 and A160720 at a(9).

Links

• Shawn A. Broyles, Table of n, a(n) for n = 0..1000

Crossrefs

Cf. A139250, A147552, A160120. A160720.