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 A257805 Partial sums of A257259: a(0) = 1; for n >= 1, a(n) = A257259(n) + a(n-1). 3
 1, 0, 0, -1, -2, -5, -6, -12, -20, -30, -37, -41, -39, -37, -51, -141, -459, -1355, -3521, -8212, -17510, -34685, -64692, -114953, -196617, -326254, -527227, -828432, -1254932, -1800115, -2361626, -2613748, -1777205, 1765725, 11078200, 31587185, 72445272, 148564309, 283768148, 516004565, 906713910, 1559424960, 2660917133, 4581930804, 8140743021, 15311144248, 31111188060, 68512065476 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS FORMULA a(0) = 1; for n >= 1, a(n) = A257259(n) + A257805(n-1). Other identities. For all n >= 0: a(n) = -A257806(A218600(n+1)). PROG (Scheme, with memoization-macro definec) (definec (A257805 n) (if (zero? n) 1 (+ (A257259 n) (A257805 (- n 1))))) ;; Alternative implementation: (define (A257805 n) (- (A257806 (A218600 (+ 1 n))))) CROSSREFS Cf. A218600, A257259, A257806. Cf. also A218542, A218543 and A218789. Sequence in context: A058601 A108365 A064765 * A082552 A243798 A057683 Adjacent sequences:  A257802 A257803 A257804 * A257806 A257807 A257808 KEYWORD sign AUTHOR Antti Karttunen, May 13 2015 STATUS approved

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Last modified December 9 00:32 EST 2019. Contains 329871 sequences. (Running on oeis4.)