1,1

Columns 1 through 3 are A000124, A000330 and A086602. The diagonals are finite and sum to A047970.

Values appear to be a transformation of A006468 (rooted planar maps). Also known as well-labeled trees (cf. A000168).

Row sums are powers of 2.

Equals A000330 + A006011 + A034263

The array begins

1

2

4

7 1

11 5

16 14 2

22 30 12

29 55 39 5

37 91 95 32 1

Cf. A006468, A000079.

Cf. A105552.

Cf. A000330, A006011 and A034261.

Sequence in context: A140154 A073694 A101966 this_sequence A077207 A001589 A006214

Adjacent sequences: A089571 A089572 A089573 this_sequence A089575 A089576 A089577

more,nonn

Alford Arnold (Alford1940(AT)aol.com), Dec 29 2003; extended May 04 2005