A038247 Triangle whose (i,j)-th entry is binomial(i,j)*5^(i-j)*5^j.

1, 5, 5, 25, 50, 25, 125, 375, 375, 125, 625, 2500, 3750, 2500, 625, 3125, 15625, 31250, 31250, 15625, 3125, 15625, 93750, 234375, 312500, 234375, 93750, 15625, 78125, 546875, 1640625, 2734375, 2734375, 1640625, 546875, 78125

Offset

0,2

References

B. N. Cyvin et al., Isomer enumeration of unbranched catacondensed polygonal systems with pentagons and heptagons, Match, No. 34 (Oct 1996), pp. 109-121.

Links

Table of n, a(n) for n=0..35.

Mathematica

Table[Binomial[i, j]5^(i-j) 5^j, {i, 0, 10}, {j, 0, i}]//Flatten (* Harvey P. Dale, May 01 2022 *)

Crossrefs

Sequence in context: A245130 A263872 A237654 * A263798 A257607 A093643

Adjacent sequences: A038244 A038245 A038246 * A038248 A038249 A038250

Keyword

nonn,tabl,easy

Author

N. J. A. Sloane.

Status

approved