login

Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.

A140303 as a triangular array

1
31
931
27931
8127931
2438127931
7292438127931
21877292438127931
656121877292438127931
19683656121877292438127931
5904919683656121877292438127931

A140303 as a square array

1392781243729218765611968359049
13927812437292187656119683
139278124372921876561
13927812437292187
1392781243729
1392781243
1392781
13927
139
13
1
1392781243729218765611968359049
13927812437292187656119683
139278124372921876561
13927812437292187
1392781243729
1392781243
1392781
13927
139
13
1