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A131772 Partial sums (A131771) equal this sequence excluding zeros located at positions {m*(m+1)/2, m>=0}, with a(0)=1. 2
1, 0, 1, 2, 0, 4, 4, 8, 0, 12, 20, 20, 32, 0, 52, 72, 104, 104, 156, 0, 228, 332, 436, 592, 592, 820, 0, 1152, 1588, 2180, 2772, 3592, 3592, 4744, 0, 6332, 8512, 11284, 14876, 18468, 23212, 23212, 29544, 0, 38056, 49340, 64216, 82684, 105896, 129108, 158652 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..50.

EXAMPLE

Partial sums (A131771) begin:

[1,1,2,4,4,8,12,20,20,32,52,72,104,104,156,228,332,436,592,...].

Second partial sums (A131770) begin:

[1,2,4,8,12,20,32,52,72,104,156,228,332,436,592,...].

PROG

(PARI)

CROSSREFS

Cf. A131770, A131771 (partial sums).

Sequence in context: A291330 A057377 A145811 * A147980 A021493 A195395

Adjacent sequences:  A131769 A131770 A131771 * A131773 A131774 A131775

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Jul 14 2007

STATUS

approved

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Last modified February 25 15:00 EST 2018. Contains 299654 sequences. (Running on oeis4.)