login

A081539 as a triangular array

0
12
121323
123124134234
12341235124513452345
123451234612356124561345623456
123456123457123467123567124567134567234567
12345671234568123457812346781235678124567813456782345678

A081539 as a square array

01121231234123451234561234567
2131241235123461234571234568
231341245123561234671234578
2341345124561235671234678
2345134561245671235678
234561345671245678
2345671345678
2345678
01121231234123451234561234567
2131241235123461234571234568
231341245123561234671234578
2341345124561235671234678
2345134561245671235678
234561345671245678
2345671345678
2345678