A240883 - OEIS

A240883

Central terms of the triangle in A240857.

0, 0, 2, 1, 2, 0, 2, 2, 2, 2, 4, 1, 2, 1, 3, 3, 2, 2, 4, 3, 4, 0, 2, 2, 2, 2, 4, 2, 3, 2, 4, 4, 2, 2, 4, 3, 4, 2, 4, 4, 4, 4, 6, 1, 2, 1, 3, 3, 2, 2, 4, 3, 4, 1, 3, 3, 3, 3, 5, 3, 4, 3, 5, 5, 2, 2, 4, 3, 4, 2, 4, 4, 4, 4, 6, 3, 4, 3, 5, 5, 4, 4, 6, 5, 6, 0

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OFFSET

0,3

LINKS

Reinhard Zumkeller, Table of n, a(n) for n = 0..10000

FORMULA

a(n) = A240857(2*n,n) = A046818(n) - 1.

MATHEMATICA

a[n_] := DigitCount[3*n + 1, 2, 1] - 1; Array[a, 100, 0] (* Amiram Eldar, Aug 01 2023 *)

PROG

(Haskell)

a240883 n = a240857 (2 * n) n