A278559 a(n) = A000041(25*n + 24).

1575, 173525, 7089500, 169229875, 2841940500, 37027355200, 397125074750, 3646072432125, 29454549941750, 213636919820625, 1412749565173450, 8620496275465025, 49005643635237875, 261578907351144125, 1319510599727473500, 6324621482504294325, 28938037257084798150

Offset

0,1

Links

Seiichi Manyama, Table of n, a(n) for n = 0..10000

Formula

a(n) = A213260(5*n + 4) = A000041(25*n + 24).

a(n) = 5^2*63*A160460(n) + 5^5*52*A278555(n-1) + 5^7*63*A278556(n-2) + 5^10*6*A278557(n-3) + 5^12*A278558(n-4) for n >= 4.

Example

a(4) = 5^2*63*A160460(4) + 5^5*52*A278555(3) + 5^7*63*A278556(2) + 5^10*6*A278557(1) + 5^12*A278558(0) = 771750 + 103512500 + 1028671875 + 1464843750 + 244140625 = 2841940500.

Crossrefs

Cf. A000041, A160460, A213260, A278555, A278556, A278557, A278558.

Sequence in context: A248694 A075460 A203087 * A263525 A183637 A223399

Adjacent sequences: A278556 A278557 A278558 * A278560 A278561 A278562

Keyword

nonn

Author

Seiichi Manyama, Nov 23 2016

Status

approved