1,2

Note that the central diagonal of table A117488 is 1 2 5 20 ...

A117488 begins

1

1 2 3

1 2 5 8 14

1 2 5 10 18 30 49

1 2 5 10 20 34 59 94 149

so a(n) begins

1 6 30 115 374 ...

Cf. A115994, A117488.

Sequence in context: A074007 A152573 A003211 this_sequence A050510 A055281 A056385

Adjacent sequences: A117486 A117487 A117488 this_sequence A117490 A117491 A117492

more,nonn

Alford Arnold (Alford1940(AT)aol.com), Mar 22 2006