cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A078277 a(n) = A078274(n)/11.

Original entry on oeis.org

1, 121, 13941, 1577761, 176141581, 1028725268301, 10304701810650121, 103228853737447031941, 1034106901028283083413761, 10359252646828302828719795581, 111956181015555937395556174359301, 1121388355628288465046488283629741121
Offset: 1

Views

Author

Amarnath Murthy, Nov 25 2002

Keywords

Crossrefs

Programs

  • PARI
    a(n) = {my(d, v=w=[1]); for(i=2, n, v=concat(v, d=digits(2*i-1)); w=concat(d, w)); fromdigits(vector(2*#v, i, if(i%2, v[1+i\2], w[i/2])))/11; } \\ Jinyuan Wang, May 17 2020 [Updated by Sean A. Irvine, Jun 26 2025]

Extensions

More terms from Sean A. Irvine, Aug 15 2011
Corrected by Sean A. Irvine, May 30 2013
Correction reverted by Sean A. Irvine, Jun 26 2025