A161208 a(n) = (A161206(n+1)-1)/2.

0, 1, 3, 6, 10, 15, 21, 28, 34, 40, 49, 61, 76, 91, 105, 120, 130, 136, 145, 158, 175, 196, 221, 249, 276, 298, 322, 354, 395, 435, 469, 502, 520, 526, 535, 548, 565, 586, 611, 640, 669, 696, 729, 774, 831, 894, 955, 1015, 1066, 1096, 1120, 1155, 1202, 1261, 1332

Offset

0,3

Links

Table of n, a(n) for n=0..54.

Crossrefs

Cf. A161206, A161207, A161209.

Sequence in context: A054636 A231680 A124158 * A109444 A124157 A033440

Adjacent sequences: A161205 A161206 A161207 * A161209 A161210 A161211

Keyword

nonn

Author

Omar E. Pol, Jun 08 2009

Extensions

More terms from Jinyuan Wang, Mar 01 2020

Status

approved