A074134 First column of triangle A074135.

1, 2, 3, 6, 10, 15, 22, 29, 36, 45, 55, 66, 78, 91, 105, 120, 136, 153, 171, 190, 210, 231, 253, 276, 301, 326, 351, 378, 406, 435, 465, 496, 528, 561, 595, 630, 666, 703, 741, 780, 820, 861, 903, 946, 990, 1035, 1081, 1128, 1176, 1225, 1275, 1326, 1378, 1431

Offset: 1

Author

Amarnath Murthy, Aug 27 2002

Keywords

• nonn
• easy
• less

Crossrefs

Cf. A074135.

Extensions

Edited and extended by David Wasserman, Oct 31 2006