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A277412 A diagonal of triangle A277410. 2
1, 13, 165, 2310, 36330, 640710, 12588345, 273544425, 6529047525, 170116046100, 4812116809500, 147071309685300, 4835838768886125, 170422360844360625, 6415409821472276625, 257182138353489599250, 10948868951071241940750, 493742086990731259931250, 23529007012831307040178125, 1182267810558397149214753125, 62507026744534189248771965625, 3470421725511913171914539625000, 201956614461150241288627906875000 (list; graph; refs; listen; history; text; internal format)
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 * A171318 A078362 A157381

Adjacent sequences:  A277409 A277410 A277411 * A277413 A277414 A277415

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Oct 25 2016

STATUS

approved

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Last modified August 12 13:59 EDT 2022. Contains 356077 sequences. (Running on oeis4.)