login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A308509 as a triangular array

1
12
132
1543
191092
117283364
1338212926242
16524451312618284
11297302049626145850413
125721888193312611954344577374
1513656232769156269959424028705811682

A308509 as a square array

11111111111
2359173365129257513
2410288224473021886562
39331295132049819332769
2626126626312615626
42418214581195499594
28503442402
4415778705
337811
468
2
11111111111
2359173365129257513
2410288224473021886562
39331295132049819332769
2626126626312615626
42418214581195499594
28503442402
4415778705
337811
468
2