A277412 A diagonal of triangle A277410.

1, 13, 165, 2310, 36330, 640710, 12588345, 273544425, 6529047525, 170116046100, 4812116809500, 147071309685300, 4835838768886125, 170422360844360625, 6415409821472276625, 257182138353489599250, 10948868951071241940750, 493742086990731259931250, 23529007012831307040178125, 1182267810558397149214753125, 62507026744534189248771965625, 3470421725511913171914539625000, 201956614461150241288627906875000

Offset

0,2

Comments

The adjacent diagonal in triangle A277410 forms the odd double factorials.

Links

Table of n, a(n) for n=0..22.

Prog

(PARI) {A277410(n, k) = my(A=x); for(i=1, n, A = x + subst(intformal(A +x*O(x^n)), x, y*A + (1-y)*x ) ); n!*polcoeff(polcoeff(A, n, x), k, y)}
for(n=0, 30, print1(A277410(n+3, n), ", "));

Crossrefs

Cf. A277410, A277411.

Sequence in context: A087400 A012828 A119539 * A368657 A171318 A078362

Adjacent sequences: A277409 A277410 A277411 * A277413 A277414 A277415

Keyword

nonn

Author

Paul D. Hanna, Oct 25 2016

Status

approved