A065222 Fill a triangular array by rows by writing numbers 1 up to b(0), 1 up to b(1), etc., where b(n) are the hexagonal numbers. The final elements of the rows form a(n).

1, 2, 5, 3, 8, 14, 6, 14, 23, 5, 16, 28, 41, 10, 25, 41, 58, 10, 29, 49, 70, 1, 24, 48, 73, 99, 6, 34, 63, 93, 124, 3, 36, 70, 105, 141, 178, 26, 65, 105, 146, 188, 231, 44, 89, 135, 182, 230, 3, 53, 104, 156, 209, 263, 318, 49, 106, 164, 223, 283, 344, 28, 91, 155, 220

Offset

0,2

Links

Table of n, a(n) for n=0..64.

Example

The array begins
....1
...1.2
..3.4.5
.6.1.2.3
4.5.6.7.8

Crossrefs

Cf. A000384, A064766, A064865, A065221, A065223-A065234.

Sequence in context: A244418 A082652 A194007 * A332354 A159988 A134880

Adjacent sequences: A065219 A065220 A065221 * A065223 A065224 A065225

Keyword

easy,nonn

Author

Floor van Lamoen, Oct 22 2001

Status

approved