1,2

J. Riordan, The blossoming of Schroeder's fourth problem, Acta Math., 137 (1976), 1-16.

Triangle begins:

1

2 2

4 16 6

8 88 116 24

Sequence in context: A121221 A122598 A087783 this_sequence A102864 A009542 A032318

Adjacent sequences: A106238 A106239 A106240 this_sequence A106242 A106243 A106244

nonn,tabl

njas, May 29 2005